<s>
Tetris	B-Application
(	O
)	O
is	O
a	O
puzzle	O
video	O
game	O
created	O
by	O
the	O
Soviet	O
software	O
engineer	O
Alexey	O
Pajitnov	O
in	O
1985	O
.	O
</s>
<s>
After	O
a	O
significant	O
period	O
of	O
publication	O
by	O
Nintendo	O
,	O
the	O
rights	O
reverted	O
to	O
Pajitnov	O
in	O
1996	O
,	O
who	O
co-founded	O
the	O
Tetris	B-Application
Company	O
with	O
Henk	O
Rogers	O
to	O
manage	O
licensing	O
.	O
</s>
<s>
In	O
Tetris	B-Application
,	O
players	O
complete	O
lines	O
by	O
moving	O
differently	O
shaped	O
pieces	O
(	O
tetrominoes	O
)	O
,	O
which	O
descend	O
onto	O
the	O
playing	O
field	O
.	O
</s>
<s>
Built	O
on	O
simple	O
rules	O
,	O
Tetris	B-Application
established	O
itself	O
as	O
one	O
of	O
the	O
greatest	O
video	O
games	O
ever	O
made	O
.	O
</s>
<s>
By	O
December	O
2011	O
,	O
it	O
had	O
sold	O
202million	O
copies	O
–	O
approximately	O
70million	O
physical	O
units	O
and	O
132million	O
paid	O
mobile	B-Application
game	I-Application
downloads	O
–	O
making	O
it	O
one	O
of	O
the	O
best-selling	B-Application
video	I-Application
game	I-Application
franchises	I-Application
.	O
</s>
<s>
The	O
Game	B-Application
Boy	I-Application
version	I-Application
is	O
one	B-Application
of	I-Application
the	I-Application
best-selling	I-Application
games	I-Application
of	I-Application
all	I-Application
time	I-Application
,	O
with	O
more	O
than	O
35million	O
copies	O
sold	O
.	O
</s>
<s>
Tetris	B-Application
is	O
available	O
on	O
over	B-Device
65	I-Device
platforms	I-Device
,	O
setting	O
a	O
Guinness	O
world	O
record	O
for	O
the	O
most	O
ported	O
video	O
game	O
.	O
</s>
<s>
Tetris	B-Application
is	O
rooted	O
within	O
popular	O
culture	O
and	O
its	O
popularity	O
extends	O
beyond	O
the	O
sphere	O
of	O
video	O
games	O
;	O
imagery	O
from	O
the	O
game	O
has	O
influenced	O
architecture	O
,	O
music	O
,	O
and	O
cosplay	O
.	O
</s>
<s>
The	O
game	O
also	O
has	O
been	O
the	O
subject	O
of	O
various	O
research	O
studies	O
that	O
have	O
analyzed	O
its	O
theoretical	O
complexity	O
and	O
have	O
shown	O
its	O
effect	O
on	O
the	O
human	O
brain	O
following	O
a	O
session	O
,	O
in	O
particular	O
the	O
Tetris	B-Application
effect	I-Application
.	O
</s>
<s>
Tetris	B-Application
is	O
primarily	O
composed	O
of	O
a	O
field	O
of	O
play	O
in	O
which	O
pieces	O
of	O
different	O
geometric	O
forms	O
,	O
called	O
"	O
tetrominoes	O
"	O
,	O
descend	O
from	O
the	O
top	O
of	O
the	O
field	O
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
complete	O
up	O
to	O
four	O
lines	O
simultaneously	O
with	O
the	O
use	O
of	O
the	O
I-shaped	O
tetromino	O
;	O
this	O
move	O
is	O
called	O
a	O
"	O
Tetris	B-Application
"	O
,	O
and	O
is	O
the	O
basis	O
of	O
the	O
game	O
's	O
title	O
.	O
</s>
<s>
Since	O
1996	O
,	O
the	O
Tetris	B-Application
Company	O
has	O
internally	O
defined	O
specifications	O
and	O
guidelines	O
to	O
which	O
publishers	O
must	O
adhere	O
to	O
be	O
granted	O
a	O
license	O
to	O
Tetris	B-Application
.	O
</s>
<s>
The	O
pieces	O
on	O
which	O
the	O
game	O
of	O
Tetris	B-Application
is	O
based	O
around	O
are	O
called	O
"	O
tetrominoes	O
"	O
.	O
</s>
<s>
Pajitnov	O
's	O
original	O
version	O
for	O
the	O
Electronika	B-Device
60	I-Device
computer	O
used	O
green	O
brackets	O
to	O
represent	O
the	O
blocks	O
that	O
make	O
up	O
tetrominoes	O
.	O
</s>
<s>
Versions	O
of	O
Tetris	B-Application
on	O
the	O
original	O
Game	O
Boy/Game	O
Boy	O
Color	O
and	O
on	O
most	O
dedicated	O
handheld	O
games	O
use	O
black-and-white	O
or	O
grayscale	O
graphics	O
,	O
but	O
most	O
popular	O
versions	O
use	O
a	O
separate	O
color	O
for	O
each	O
distinct	O
shape	O
.	O
</s>
<s>
Prior	O
to	O
the	O
Tetris	B-Application
Company	O
's	O
standardization	O
in	O
the	O
early	O
2000s	O
,	O
those	O
colors	O
varied	O
widely	O
from	O
implementation	O
to	O
implementation	O
.	O
</s>
<s>
The	O
scoring	O
formula	O
for	O
the	O
majority	O
of	O
Tetris	B-Application
products	O
is	O
built	O
on	O
the	O
idea	O
that	O
more	O
difficult	O
line	O
clears	O
should	O
be	O
awarded	O
more	O
points	O
.	O
</s>
<s>
For	O
example	O
,	O
a	O
single	O
line	O
clear	O
in	O
Tetris	B-Application
Zone	O
is	O
worth	O
100	O
points	O
,	O
clearing	O
four	O
lines	O
at	O
once	O
(	O
known	O
as	O
a	O
Tetris	B-Application
)	O
is	O
worth	O
800	O
,	O
while	O
each	O
subsequent	O
back-to-back	O
Tetris	B-Application
is	O
worth	O
1,200	O
.	O
</s>
<s>
Nearly	O
all	O
Tetris	B-Application
games	O
allow	O
the	O
player	O
to	O
press	O
a	O
button	O
to	O
increase	O
the	O
speed	O
of	O
the	O
current	O
piece	O
's	O
descent	O
or	O
cause	O
the	O
piece	O
to	O
drop	O
and	O
lock	O
into	O
place	O
immediately	O
,	O
known	O
as	O
a	O
"	O
soft	O
drop	O
"	O
and	O
a	O
"	O
hard	O
drop	O
"	O
,	O
respectively	O
.	O
</s>
<s>
Modern	O
versions	O
of	O
Tetris	B-Application
released	O
after	O
2001	O
use	O
a	O
bag-style	O
randomizer	O
that	O
guarantees	O
players	O
will	O
never	O
receive	O
more	O
than	O
four	O
S	O
and	O
Z	O
pieces	O
in	O
a	O
row	O
by	O
shuffling	O
tetrominoes	O
of	O
all	O
types	O
for	O
each	O
7	O
pieces	O
.	O
</s>
<s>
This	O
is	O
one	O
of	O
the	O
"	O
Indispensable	O
Rules	O
"	O
enforced	O
by	O
the	O
Tetris	B-Application
Guideline	O
that	O
all	O
officially	O
licensed	O
Tetris	B-Application
games	O
must	O
follow	O
.	O
</s>
<s>
"	O
Easy	O
spin	O
"	O
,	O
or	O
"	O
infinite	O
spin	O
"	O
,	O
is	O
a	O
feature	O
in	O
some	O
Tetris	B-Application
games	O
where	O
a	O
tetromino	O
stops	O
falling	O
for	O
a	O
moment	O
after	O
left	O
or	O
right	O
movement	O
or	O
rotation	O
,	O
effectively	O
allowing	O
the	O
player	O
to	O
suspend	O
the	O
piece	O
while	O
deciding	O
where	O
to	O
place	O
it	O
.	O
</s>
<s>
The	O
mechanic	O
was	O
introduced	O
in	O
1999	O
's	O
The	O
Next	O
Tetris	B-Application
,	O
and	O
drew	O
criticism	O
in	O
reviews	O
of	O
2001	O
's	O
Tetris	B-Application
Worlds	O
.	O
</s>
<s>
This	O
feature	O
has	O
been	O
implemented	O
into	O
the	O
Tetris	B-Application
Company	O
's	O
official	O
guideline	O
.	O
</s>
<s>
This	O
type	O
of	O
play	O
differs	O
from	O
traditional	O
Tetris	B-Application
because	O
it	O
takes	O
away	O
the	O
pressure	O
of	O
higher	O
level	O
speed	O
.	O
</s>
<s>
The	O
goal	O
in	O
Tetris	B-Application
Worlds	O
,	O
however	O
,	O
is	O
to	O
complete	O
a	O
certain	O
number	O
of	O
lines	O
as	O
fast	O
as	O
possible	O
,	O
so	O
the	O
ability	O
to	O
hold	O
off	O
a	O
piece	O
's	O
placement	O
will	O
not	O
make	O
achieving	O
that	O
goal	O
any	O
faster	O
.	O
</s>
<s>
Later	O
,	O
GameSpot	O
received	O
"	O
easy	O
spin	O
"	O
more	O
openly	O
,	O
saying	O
that	O
"	O
the	O
infinite	O
spin	O
issue	O
honestly	O
really	O
affects	O
only	O
a	O
few	O
of	O
the	O
single-player	O
gameplay	O
modes	O
in	O
Tetris	B-Application
DS	O
,	O
because	O
any	O
competitive	O
mode	O
requires	O
you	O
to	O
lay	O
down	O
pieces	O
as	O
quickly	O
as	O
humanly	O
possible.	O
"	O
</s>
<s>
In	O
1979	O
,	O
Alexey	O
Pajitnov	O
joined	O
the	O
Computer	O
Center	O
of	O
the	O
Soviet	O
Academy	O
of	O
Sciences	O
as	O
a	O
speech	B-Application
recognition	I-Application
researcher	O
.	O
</s>
<s>
Pajitnov	O
developed	O
several	O
puzzle	O
games	O
on	O
the	O
institute	O
's	O
computer	O
,	O
an	O
Electronika	B-Device
60	I-Device
,	O
a	O
scarce	O
resource	O
at	O
the	O
time	O
.	O
</s>
<s>
Pajitnov	O
titled	O
the	O
game	O
Tetris	B-Application
,	O
a	O
word	O
created	O
from	O
a	O
combination	O
of	O
"	O
tetra	O
"	O
(	O
meaning	O
"	O
four	O
"	O
)	O
and	O
his	O
favorite	O
sport	O
,	O
"	O
tennis	B-Device
"	O
.	O
</s>
<s>
Because	O
the	O
Electronika	B-Device
60	I-Device
had	O
no	O
graphical	B-Application
interface	I-Application
,	O
Pajitnov	O
modelled	O
the	O
field	O
and	O
pieces	O
using	O
spaces	O
and	O
brackets	O
.	O
</s>
<s>
Realizing	O
that	O
completed	O
lines	O
filled	O
the	O
screen	O
quickly	O
,	O
Pajitnov	O
decided	O
to	O
delete	O
them	O
,	O
creating	O
a	O
key	O
part	O
of	O
Tetris	B-Application
gameplay	O
.	O
</s>
<s>
This	O
early	O
version	O
of	O
Tetris	B-Application
had	O
no	O
scoring	O
system	O
and	O
no	O
levels	O
,	O
but	O
its	O
addictive	O
quality	O
distinguished	O
it	O
from	O
the	O
other	O
puzzle	O
games	O
Pajitnov	O
had	O
created	O
.	O
</s>
<s>
Pajitnov	O
had	O
completed	O
the	O
first	O
playable	O
version	O
of	O
Tetris	B-Application
1985	O
.	O
</s>
<s>
Pajitnov	O
presented	O
Tetris	B-Application
to	O
his	O
colleagues	O
,	O
who	O
quickly	O
became	O
addicted	O
to	O
it	O
.	O
</s>
<s>
A	O
friend	O
of	O
Pajitnov	O
,	O
Vladimir	O
Pokhilko	O
,	O
who	O
requested	O
the	O
game	O
for	O
the	O
Moscow	O
Medical	O
Institute	O
,	O
saw	O
people	O
stop	O
working	O
to	O
play	O
Tetris	B-Application
.	O
</s>
<s>
Pajitnov	O
sought	O
to	O
adapt	O
Tetris	B-Application
to	O
the	O
IBM	B-Device
Personal	I-Device
Computer	I-Device
,	O
which	O
had	O
a	O
higher	O
quality	O
display	O
than	O
the	O
Electronika	B-Device
60	I-Device
.	O
</s>
<s>
Gerasimov	O
adapted	O
Tetris	B-Application
to	O
the	O
IBM	B-Device
PC	I-Device
over	O
the	O
course	O
of	O
a	O
few	O
weeks	O
,	O
incorporating	O
color	O
and	O
a	O
scoreboard	O
.	O
</s>
<s>
Pajitnov	O
wanted	O
to	O
export	O
Tetris	B-Application
,	O
but	O
had	O
no	O
knowledge	O
of	O
the	O
business	O
world	O
.	O
</s>
<s>
Pajitnov	O
asked	O
his	O
supervisor	O
Victor	O
Brjabrin	O
,	O
who	O
had	O
knowledge	O
of	O
the	O
world	O
outside	O
the	O
Soviet	O
Union	O
,	O
to	O
help	O
him	O
publish	O
Tetris	B-Application
.	O
</s>
<s>
In	O
1986	O
,	O
Brjabrin	O
sent	O
a	O
copy	O
of	O
Tetris	B-Application
to	O
Hungarian	O
game	O
publisher	O
Novotrade	O
.	O
</s>
<s>
From	O
there	O
,	O
copies	O
of	O
the	O
game	O
began	O
circulating	O
via	O
floppy	B-Device
disks	I-Device
throughout	O
Hungary	O
and	O
as	O
far	O
as	O
Poland	O
.	O
</s>
<s>
The	O
latter	O
obtained	O
the	O
rights	O
after	O
a	O
visit	O
to	O
Mirrorsoft	O
by	O
Spectrum	O
HoloByte	O
president	O
Phil	O
Adam	O
in	O
which	O
he	O
played	O
Tetris	B-Application
for	O
two	O
hours	O
.	O
</s>
<s>
Before	O
releasing	O
Tetris	B-Application
in	O
the	O
United	O
States	O
,	O
Spectrum	O
HoloByte	O
CEO	O
Gilman	O
Louie	O
asked	O
for	O
an	O
overhaul	O
of	O
the	O
game	O
's	O
graphics	O
and	O
music	O
.	O
</s>
<s>
The	O
Spectrum	O
HoloByte	O
version	O
was	O
released	O
for	O
the	O
DOS	O
PCs	B-Device
in	O
January	O
1988	O
,	O
with	O
other	O
platforms	O
following	O
over	O
the	O
next	O
year	O
.	O
</s>
<s>
Mirrorsoft	O
ported	O
Tetris	B-Application
to	O
platforms	O
including	O
the	O
Amiga	B-Device
,	O
Atari	B-Device
ST	I-Device
,	O
ZX	B-Operating_System
Spectrum	I-Operating_System
,	O
Commodore	O
64	O
and	O
Amstrad	B-Device
CPC	I-Device
.	O
</s>
<s>
Tetris	B-Application
was	O
a	O
commercial	O
success	O
in	O
Europe	O
and	O
the	O
United	O
States	O
:	O
Mirrorsoft	O
sold	O
tens	O
of	O
thousands	O
of	O
copies	O
in	O
two	O
months	O
,	O
and	O
Spectrum	O
HoloByte	O
sold	O
over	O
100,000	O
units	O
in	O
the	O
space	O
of	O
a	O
year	O
.	O
</s>
<s>
According	O
to	O
Spectrum	O
HoloByte	O
,	O
the	O
average	O
Tetris	B-Application
player	O
was	O
between	O
25	O
and	O
45	O
years	O
old	O
and	O
was	O
a	O
manager	O
or	O
engineer	O
.	O
</s>
<s>
At	O
the	O
Software	O
Publishers	O
Association	O
's	O
Excellence	O
in	O
Software	O
Awards	O
ceremony	O
in	O
March	O
1988	O
,	O
Tetris	B-Application
won	O
Best	O
Entertainment	O
Software	O
,	O
Best	O
Original	O
Game	O
,	O
Best	O
Strategy	O
Program	O
,	O
and	O
Best	O
Consumer	O
Software	O
.	O
</s>
<s>
On	O
May	O
10	O
he	O
signed	O
a	O
contract	O
for	O
a	O
ten-year	O
worldwide	O
Tetris	B-Application
license	O
for	O
all	O
current	O
and	O
future	O
computer	O
systems	O
.	O
</s>
<s>
Mirrorsoft	O
sold	O
arcade	O
rights	O
to	O
Atari	O
Games	O
subsidiary	O
Tengen	O
,	O
which	O
then	O
sold	O
the	O
Japanese	O
arcade	O
rights	O
to	O
Sega	O
and	O
the	O
console	O
rights	O
to	O
BPS	O
,	O
which	O
published	O
versions	O
for	O
Japanese	O
computers	O
,	O
including	O
the	O
MSX2	B-Operating_System
,	O
PC-88	B-Device
and	O
X68000	B-Device
,	O
along	O
with	O
a	O
console	O
port	O
for	O
the	O
Nintendo	O
Family	O
Computer	O
(	O
Famicom	O
)	O
,	O
known	O
outside	O
Japan	O
as	O
the	O
Nintendo	O
Entertainment	O
System	O
.	O
</s>
<s>
At	O
this	O
point	O
,	O
almost	O
a	O
dozen	O
companies	O
believed	O
they	O
held	O
the	O
Tetris	B-Application
rights	O
,	O
with	O
Stein	O
retaining	O
rights	O
for	O
home	O
computer	O
versions	O
.	O
</s>
<s>
Tetris	B-Application
was	O
a	O
commercial	O
success	O
in	O
North	O
America	O
,	O
Europe	O
and	O
Asia	O
.	O
</s>
<s>
The	O
same	O
year	O
,	O
Nintendo	O
was	O
preparing	O
to	O
launch	O
its	O
first	O
portable	O
console	O
,	O
the	O
Game	B-Device
Boy	I-Device
.	O
</s>
<s>
Nintendo	O
was	O
attracted	O
to	O
Tetris	B-Application
by	O
its	O
simplicity	O
and	O
established	O
success	O
on	O
the	O
Famicom	O
.	O
</s>
<s>
During	O
the	O
discussions	O
,	O
Rogers	O
explained	O
that	O
he	O
wanted	O
to	O
obtain	O
the	O
rights	O
to	O
Tetris	B-Application
for	O
the	O
Game	B-Device
Boy	I-Device
.	O
</s>
<s>
After	O
quickly	O
obtaining	O
an	O
agreement	O
with	O
Elorg	O
president	O
Nikolai	O
Belikov	O
,	O
Rogers	O
showed	O
Belikov	O
a	O
Famicom	O
Tetris	B-Application
cartridge	O
.	O
</s>
<s>
Belikov	O
was	O
surprised	O
,	O
as	O
he	O
believed	O
at	O
the	O
time	O
that	O
the	O
rights	O
to	O
Tetris	B-Application
were	O
only	O
signed	O
for	O
computer	O
systems	O
.	O
</s>
<s>
In	O
March	O
1989	O
,	O
Nintendo	O
sent	O
a	O
cease	O
and	O
desist	O
to	O
Atari	O
Games	O
concerning	O
production	O
of	O
the	O
NES	B-Application
version	I-Application
of	O
Tetris	B-Application
.	O
</s>
<s>
The	O
next	O
day	O
,	O
Atari	O
Games	O
withdrew	O
its	O
NES	B-Application
version	I-Application
from	O
sale	O
,	O
and	O
thousands	O
of	O
cartridges	O
remained	O
unsold	O
in	O
the	O
company	O
's	O
warehouses	O
.	O
</s>
<s>
Sega	O
had	O
planned	O
to	O
release	O
a	O
Genesis	B-Operating_System
version	O
of	O
Tetris	B-Application
on	O
April	O
15	O
,	O
1989	O
,	O
but	O
cancelled	O
its	O
release	O
during	O
Nintendo	O
and	O
Atari	O
's	O
legal	O
battle	O
;	O
fewer	O
than	O
ten	O
copies	O
were	O
manufactured	O
.	O
</s>
<s>
A	O
new	O
port	O
of	O
the	O
arcade	O
version	O
by	O
M2	O
was	O
included	O
in	O
the	O
Sega	B-Application
Genesis	I-Application
Mini	I-Application
microconsole	O
,	O
released	O
in	O
September	O
2019	O
.	O
</s>
<s>
At	O
the	O
same	O
time	O
,	O
sales	O
of	O
the	O
Game	B-Device
Boy	I-Device
–	O
bundled	O
with	O
a	O
handheld	O
version	O
of	O
Tetris	B-Application
–	O
exploded	O
,	O
exceeding	O
sales	O
forecasts	O
three	O
times	O
.	O
</s>
<s>
In	O
April	O
1996	O
,	O
as	O
agreed	O
with	O
the	O
Academy	O
ten	O
years	O
earlier	O
and	O
following	O
an	O
agreement	O
with	O
Rogers	O
,	O
the	O
rights	O
to	O
Tetris	B-Application
reverted	O
to	O
Pajitnov	O
.	O
</s>
<s>
Pajitnov	O
and	O
Rogers	O
founded	O
the	O
Tetris	B-Application
Company	O
in	O
June	O
1996	O
to	O
manage	O
the	O
rights	O
on	O
all	O
platforms	O
,	O
the	O
previous	O
agreements	O
having	O
expired	O
.	O
</s>
<s>
Pajitnov	O
now	O
receives	O
a	O
royalty	O
for	O
each	O
Tetris	B-Application
game	O
and	O
derivative	O
sold	O
worldwide	O
.	O
</s>
<s>
In	O
2002	O
,	O
Pajitnov	O
and	O
Rogers	O
founded	O
Tetris	B-Application
Holding	O
after	O
the	O
purchase	O
of	O
the	O
game	O
's	O
remaining	O
rights	O
from	O
Elorg	O
,	O
now	O
a	O
private	O
entity	O
following	O
the	O
dissolution	O
of	O
the	O
Soviet	O
Union	O
.	O
</s>
<s>
The	O
Tetris	B-Application
Company	O
now	O
owns	O
all	O
rights	O
to	O
the	O
Tetris	B-Application
brand	O
,	O
and	O
is	O
mainly	O
responsible	O
for	O
removing	O
unlicensed	O
clones	O
from	O
the	O
market	O
.	O
</s>
<s>
The	O
company	O
regularly	O
calls	O
on	O
Apple	O
Inc	O
.	O
and	O
Google	B-Application
to	O
remove	O
illegal	O
versions	O
from	O
their	O
mobile	O
app	B-Application
stores	I-Application
.	O
</s>
<s>
In	O
one	O
notable	O
2012	O
case	O
,	O
Tetris	B-Application
Holding	O
,	O
LLC	O
v	O
.	O
Xio	O
Interactive	O
,	O
Inc.	O
,	O
Tetris	B-Application
Holding	O
and	O
the	O
Tetris	B-Application
Company	O
defended	O
its	O
copyright	O
against	O
an	O
iOS	O
clone	O
,	O
which	O
established	O
a	O
new	O
stance	O
on	O
evaluating	O
video	O
game	O
clone	O
infringements	O
based	O
on	O
look	B-Application
and	I-Application
feel	I-Application
.	O
</s>
<s>
In	O
December	O
2005	O
,	O
Electronic	O
Arts	O
acquired	O
Jamdat	O
,	O
a	O
company	O
specializing	O
in	O
mobile	B-Application
games	I-Application
.	O
</s>
<s>
Jamdat	O
had	O
previously	O
bought	O
a	O
company	O
founded	O
by	O
Rogers	O
in	O
2001	O
,	O
which	O
managed	O
the	O
Tetris	B-Application
license	O
on	O
mobile	O
platforms	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
Electronic	O
Arts	O
held	O
a	O
15-year	O
license	O
on	O
all	O
mobile	O
phone	O
releases	O
of	O
Tetris	B-Application
,	O
which	O
expired	O
on	O
April	O
21	O
,	O
2020	O
.	O
</s>
<s>
Tetris	B-Application
has	O
been	O
released	O
on	O
a	O
multitude	O
of	O
platforms	O
since	O
the	O
creation	O
of	O
the	O
original	O
version	O
on	O
the	O
Electronika	B-Device
60	I-Device
.	O
</s>
<s>
The	O
game	O
is	O
available	O
on	O
most	O
game	O
consoles	O
and	O
is	O
playable	O
on	O
personal	B-Device
computers	I-Device
,	O
smartphones	O
and	O
iPods	B-Device
.	O
</s>
<s>
Guinness	O
World	O
Records	O
recognized	O
Tetris	B-Application
as	O
the	O
most	O
ported	O
video	O
game	O
in	O
history	O
,	O
having	O
appeared	O
on	O
over	O
65	O
different	O
platforms	O
as	O
of	O
October	O
2010	O
.	O
</s>
<s>
However	O
,	O
commercial	O
versions	O
not	O
approved	O
by	O
the	O
Tetris	B-Application
Company	O
tend	O
to	O
be	O
purged	O
due	O
to	O
company	O
policy	O
.	O
</s>
<s>
The	O
most	O
famous	O
online	O
version	O
,	O
Tetris	B-Operating_System
Friends	I-Operating_System
by	O
Tetris	B-Application
Online	O
,	O
Inc.	O
,	O
had	O
attracted	O
over	O
a	O
million	O
registered	O
users	O
.	O
</s>
<s>
Tetris	B-Application
Online	O
had	O
also	O
developed	O
versions	O
for	O
console-based	O
digital	O
download	O
services	O
.	O
</s>
<s>
Because	O
of	O
its	O
popularity	O
and	O
simplicity	O
of	O
development	O
,	O
Tetris	B-Application
is	O
often	O
used	O
as	O
a	O
hello	O
world	O
project	O
for	O
programmers	O
coding	O
for	O
a	O
new	O
system	O
or	O
programming	O
language	O
.	O
</s>
<s>
For	O
instance	O
,	O
μTorrent	B-Application
and	O
GNU	B-Application
Emacs	I-Application
contain	O
similar	O
shape-stacking	O
games	O
as	O
easter	O
eggs	O
.	O
</s>
<s>
Some	O
concepts	O
developed	O
on	O
official	O
versions	O
have	O
been	O
integrated	O
into	O
the	O
Tetris	B-Application
guidelines	O
in	O
order	O
to	O
standardize	O
future	O
versions	O
and	O
allow	O
players	O
to	O
migrate	O
between	O
different	O
versions	O
with	O
little	O
effort	O
.	O
</s>
<s>
The	O
IBM	B-Device
PC	I-Device
version	O
was	O
the	O
most	O
evolved	O
from	O
the	O
original	O
version	O
,	O
featuring	O
a	O
graphical	B-Application
interface	I-Application
,	O
colored	O
tetrominoes	O
,	O
running	O
statistics	O
for	O
the	O
number	O
of	O
tetrominoes	O
placed	O
,	O
and	O
a	O
guide	O
for	O
the	O
controls	O
.	O
</s>
<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
it	O
is	O
common	O
to	O
analyze	O
the	O
computational	O
complexity	O
of	O
problems	O
,	O
including	O
real	O
life	O
problems	O
and	O
games	O
.	O
</s>
<s>
It	O
was	O
proven	O
that	O
for	O
the	O
"	O
offline	O
"	O
version	O
of	O
Tetris	B-Application
(	O
the	O
player	O
knows	O
the	O
complete	O
sequence	O
of	O
pieces	O
that	O
will	O
be	O
dropped	O
,	O
i.e.	O
</s>
<s>
To	O
prove	O
NP-completeness	O
,	O
it	O
was	O
shown	O
that	O
there	O
is	O
a	O
polynomial	O
reduction	B-Algorithm
between	O
the	O
3-partition	B-Algorithm
problem	I-Algorithm
,	O
which	O
is	O
also	O
NP-complete	O
,	O
and	O
the	O
Tetris	B-Application
problem	O
.	O
</s>
<s>
The	O
earliest	O
versions	O
of	O
Tetris	B-Application
had	O
no	O
music	O
.	O
</s>
<s>
The	O
NES	B-Application
version	I-Application
includes	O
two	O
original	O
compositions	O
by	O
Hirokazu	O
Tanaka	O
along	O
with	O
an	O
arrangement	O
of	O
"	O
Dance	O
of	O
the	O
Sugar	O
Plum	O
Fairy	O
"	O
from	O
the	O
second	O
act	O
of	O
The	O
Nutcracker	O
,	O
composed	O
by	O
Tchaikovsky	O
.	O
</s>
<s>
1860s	O
Russian	O
folk	O
tune	O
"	O
Korobeiniki	O
"	O
first	O
appeared	O
in	O
Spectrum	O
Holobyte	O
's	O
1988	O
versions	O
of	O
Tetris	B-Application
together	O
"	O
Dark	O
Eyes	O
"	O
,	O
"	O
Polyushko-polye	O
"	O
and	O
"	O
The	O
Birch	O
Tree	O
"	O
.	O
</s>
<s>
Nintendo	O
's	O
Game	B-Application
Boy	I-Application
version	I-Application
also	O
includes	O
"	O
Korobeiniki	O
"	O
,	O
as	O
well	O
as	O
the	O
Johann	O
Sebastian	O
Bach	O
's	O
French	O
Suite	O
No	O
.	O
</s>
<s>
"	O
Korobeiniki	O
"	O
is	O
used	O
in	O
most	O
versions	O
of	O
the	O
game	O
,	O
and	O
has	O
appeared	O
in	O
other	O
games	O
,	O
albums	O
and	O
films	O
that	O
make	O
reference	O
to	O
Tetris	B-Application
.	O
</s>
<s>
It	O
was	O
also	O
included	O
in	O
the	O
SNES	O
Tetris	B-Application
game	O
,	O
Tetris	B-Application
&	O
Dr.	O
Mario	O
,	O
Tetris	B-Application
DS	O
and	O
Blue	O
Planet	O
Software	O
The	O
Next	O
Tetris	B-Application
(	O
1999	O
,	O
PSX	O
and	O
Windows	O
)	O
.	O
</s>
<s>
Doctor	O
Spin	O
's	O
1992	O
Eurodance	O
cover	O
(	O
under	O
the	O
name	O
"	O
Tetris	B-Application
"	O
)	O
reached	O
#6	O
on	O
the	O
UK	O
singles	O
chart	O
.	O
</s>
<s>
In	O
the	O
2000s	O
,	O
the	O
Tetris	B-Application
Company	O
added	O
as	O
a	O
prerequisite	O
for	O
the	O
granting	O
of	O
the	O
license	O
that	O
a	O
version	O
of	O
"	O
Korobeiniki	O
"	O
be	O
available	O
in	O
the	O
game	O
.	O
</s>
<s>
Tetris	B-Application
can	O
cause	O
the	O
brain	O
to	O
involuntarily	O
picture	O
Tetris	B-Application
combinations	O
even	O
when	O
the	O
player	O
is	O
not	O
playing	O
(	O
the	O
Tetris	B-Application
effect	I-Application
)	O
,	O
although	O
this	O
can	O
occur	O
with	O
any	O
computer	O
game	O
or	O
situation	O
showcasing	O
repeated	O
images	O
or	O
scenarios	O
,	O
such	O
as	O
a	O
jigsaw	B-Application
puzzle	I-Application
.	O
</s>
<s>
While	O
debates	O
about	O
Tetris	B-Application
's	O
cognitive	O
benefits	O
continue	O
,	O
some	O
researchers	O
view	O
it	O
as	O
a	O
milestone	O
in	O
the	O
gamification	O
of	O
education	O
.	O
</s>
<s>
The	O
Tetris	B-Application
Effect	I-Application
is	O
when	O
people	O
who	O
may	O
play	O
games	O
like	O
Tetris	B-Application
see	O
floating	O
pieces	O
.	O
</s>
<s>
The	O
study	O
showed	O
that	O
regular	O
Tetris	B-Application
playing	O
allowed	O
the	O
brain	O
to	O
perform	O
more	O
optimally	O
,	O
and	O
even	O
increased	O
the	O
thickness	O
of	O
the	O
cerebral	O
cortex	O
.	O
</s>
<s>
Prolonged	O
Tetris	B-Application
activity	O
can	O
also	O
lead	O
to	O
more	O
efficient	O
brain	O
activity	O
during	O
play	O
.	O
</s>
<s>
When	O
first	O
playing	O
Tetris	B-Application
,	O
brain	O
function	O
and	O
activity	O
increases	O
,	O
along	O
with	O
greater	O
cerebral	O
energy	O
consumption	O
,	O
measured	O
by	O
glucose	O
metabolic	O
rate	O
.	O
</s>
<s>
As	O
Tetris	B-Application
players	O
become	O
more	O
proficient	O
,	O
their	O
brains	O
show	O
a	O
reduced	O
consumption	O
of	O
glucose	O
,	O
indicating	O
more	O
efficient	O
brain	O
activity	O
for	O
this	O
task	O
.	O
</s>
<s>
According	O
to	O
one	O
study	O
,	O
moderate	O
play	O
of	O
Tetris	B-Application
(	O
half-an-hour	O
a	O
day	O
for	O
three	O
months	O
)	O
boosts	O
general	O
cognitive	O
functions	O
such	O
as	O
"	O
critical	O
thinking	O
,	O
reasoning	O
,	O
language	O
and	O
processing	O
"	O
and	O
increases	O
cerebral	O
cortex	O
thickness	O
.	O
</s>
<s>
Jackie	O
Andrade	O
and	O
Jon	O
May	O
,	O
from	O
Plymouth	O
University	O
's	O
Cognition	O
Institute	O
,	O
and	O
doctoral	O
student	O
Jessica	O
Skorka-Brown	O
have	O
conducted	O
research	O
that	O
shows	O
that	O
playing	O
Tetris	B-Application
could	O
distract	O
from	O
cravings	O
and	O
give	O
a	O
"	O
quick	O
and	O
manageable	O
"	O
fix	O
for	O
people	O
struggling	O
to	O
stick	O
to	O
diets	O
,	O
or	O
quit	O
smoking	O
or	O
drinking	O
.	O
</s>
<s>
Harvard	O
University	O
researcher	O
Robert	O
Stickgold	O
conducted	O
extensive	O
studies	O
in	O
2000	O
relating	O
sleep	O
to	O
Tetris	B-Application
.	O
</s>
<s>
After	O
playing	O
several	O
hours	O
each	O
night	O
before	O
bed	O
,	O
60%	O
of	O
users	O
reported	O
seeing	O
pieces	O
of	O
Tetris	B-Application
as	O
they	O
fell	O
asleep	O
,	O
and	O
even	O
when	O
they	O
are	O
waking	O
up	O
.	O
</s>
<s>
This	O
is	O
a	O
result	O
of	O
hours	O
of	O
game	O
play	O
,	O
which	O
allows	O
the	O
brain	O
to	O
start	O
creating	O
new	O
neural	B-General_Concept
pathways	I-General_Concept
.	O
</s>
<s>
Using	O
his	O
findings	O
to	O
build	O
off	O
of	O
Richard	O
Haier	O
's	O
previous	O
work	O
,	O
he	O
coined	O
the	O
term	O
Tetris	B-Application
Effect	I-Application
.	O
</s>
<s>
In	O
January	O
2009	O
,	O
an	O
Oxford	O
University	O
research	O
group	O
headed	O
by	O
Emily	O
Holmes	O
reported	O
that	O
,	O
for	O
healthy	O
volunteers	O
,	O
playing	O
Tetris	B-Application
soon	O
after	O
viewing	O
traumatic	O
material	O
in	O
the	O
laboratory	O
reduced	O
the	O
number	O
of	O
flashbacks	O
to	O
those	O
scenes	O
in	O
the	O
following	O
week	O
.	O
</s>
<s>
A	O
2017	O
study	O
found	O
that	O
people	O
who	O
played	O
Tetris	B-Application
,	O
and	O
similar	O
games	O
such	O
as	O
Candy	B-Application
Crush	I-Application
,	O
while	O
waiting	O
for	O
treatment	O
following	O
traffic	O
accidents	O
had	O
fewer	O
intrusive	O
memories	O
the	O
following	O
week	O
.	O
</s>
<s>
A	O
study	O
conducted	O
by	O
Mind	O
Research	O
Network	O
in	O
2009	O
noticed	O
that	O
girls	O
who	O
played	O
Tetris	B-Application
for	O
30	O
minutes	O
over	O
a	O
3	O
month	O
period	O
showed	O
a	O
higher	O
function	O
in	O
brain	O
efficiency	O
,	O
and	O
cortical	O
thickness	O
.	O
</s>
<s>
Prolong	O
Tetris	B-Application
playing	O
may	O
have	O
significant	O
improvement	O
on	O
players	O
 '	O
cognitive	O
skills	O
,	O
spatial	O
awareness	O
,	O
and	O
memory	O
retention	O
.	O
</s>
<s>
Another	O
notable	O
effect	O
is	O
that	O
,	O
according	O
to	O
a	O
Canadian	O
study	O
in	O
April	O
2013	O
,	O
playing	O
Tetris	B-Application
has	O
been	O
found	O
to	O
treat	O
older	O
adolescents	O
with	O
amblyopia	O
(	O
lazy	O
eye	O
)	O
,	O
which	O
was	O
better	O
than	O
patching	O
a	O
victim	O
's	O
well	O
eye	O
to	O
train	O
their	O
weaker	O
eye	O
.	O
</s>
<s>
Tetris	B-Application
is	O
addictive	O
because	O
of	O
the	O
Zeigarnik	O
effect	O
,	O
that	O
the	O
human	O
brain	O
stores	O
incomplete	O
tasks	O
,	O
and	O
disposes	O
of	O
them	O
when	O
no	O
longer	O
needed	O
.	O
</s>
<s>
Tetris	B-Application
,	O
by	O
constantly	O
creating	O
new	O
unfinished	O
tasks	O
,	O
holds	O
our	O
attention	O
.	O
</s>
<s>
The	O
study	O
categorized	O
Tetris	B-Application
as	O
a	O
casual	O
video	O
game	O
.	O
</s>
<s>
Tetris	B-Application
was	O
also	O
included	O
in	O
this	O
category	O
as	O
a	O
relaxation	O
tool	O
for	O
many	O
who	O
struggled	O
with	O
anxiety	O
.	O
</s>
<s>
called	O
the	O
IBM	O
version	O
of	O
Tetris	B-Application
"	O
one	O
of	O
the	O
most	O
addictive	O
computer	O
games	O
this	O
side	O
of	O
the	O
Berlin	O
Wall	O
...	O
 [ it ] 	O
is	O
not	O
the	O
game	O
to	O
start	O
if	O
you	O
have	O
work	O
to	O
do	O
or	O
an	O
appointment	O
to	O
keep	O
.	O
</s>
<s>
Noting	O
that	O
Tetris	B-Application
was	O
not	O
copy-protected	O
,	O
he	O
wrote	O
:	O
"	O
Obviously	O
,	O
the	O
game	O
is	O
meant	O
to	O
find	O
its	O
way	O
onto	O
every	O
American	O
machine	O
"	O
.	O
</s>
<s>
The	O
Lessers	O
later	O
reviewed	O
Spectrum	O
HoloByte	O
's	O
Macintosh	B-Device
version	O
of	O
Tetris	B-Application
in	O
1989	O
in	O
Dragon	O
No	O
.	O
</s>
<s>
Macworld	O
reviewed	O
the	O
Macintosh	B-Device
version	O
of	O
Tetris	B-Application
in	O
1988	O
,	O
praising	O
its	O
strategic	O
gameplay	O
,	O
stating	O
that	O
"	O
Tetris	B-Application
offers	O
the	O
rare	O
combination	O
of	O
being	O
simple	O
to	O
learn	O
but	O
extremely	O
challenging	O
to	O
play	O
"	O
,	O
and	O
also	O
praising	O
the	O
inclusion	O
of	O
the	O
Desk	B-Application
Accessory	I-Application
version	O
,	O
which	O
uses	O
less	O
RAM	O
.	O
</s>
<s>
Macworld	O
summarized	O
their	O
review	O
by	O
listing	O
Tetris	B-Application
 '	O
pros	O
and	O
cons	O
,	O
stating	O
that	O
Tetris	B-Application
is	O
"	O
elegant	O
;	O
easy	O
to	O
play	O
;	O
challenging	O
and	O
addicting	O
;	O
requires	O
quick	O
thinking	O
,	O
long-term	O
strategy	O
,	O
and	O
lightning	O
reflexes	O
"	O
and	O
listed	O
Tetris'''	O
cons	O
as	O
"	O
None	O
"	O
.	O
</s>
<s>
Roy	O
Wagner	O
reviewed	O
the	O
game	O
for	O
Computer	O
Gaming	O
World	O
,	O
and	O
said	O
that	O
"	O
Tetris	B-Application
is	O
simple	O
in	O
concept	O
,	O
simple	O
to	O
play	O
,	O
and	O
a	O
unique	O
design	O
"	O
.	O
</s>
<s>
There	O
was	O
a	O
hoax	O
that	O
circulated	O
in	O
February	O
2019	O
that	O
the	O
original	O
NES	O
instruction	O
manual	O
for	O
Tetris	B-Application
had	O
named	O
the	O
seven	O
tetrominoes	O
with	O
names	O
like	O
"	O
Orange	O
Ricky	O
"	O
,	O
"	O
Hero	O
"	O
and	O
"	O
Smashboy	O
"	O
,	O
but	O
was	O
disproven	O
.	O
</s>
<s>
Spectrum	O
HoloByte	O
's	O
versions	O
for	O
personal	B-Device
computers	I-Device
sold	O
150,000	O
copies	O
for	O
(	O
adjusted	O
for	O
inflation	O
)	O
in	O
two	O
years	O
,	O
between	O
1988	O
and	O
1990	O
.	O
</s>
<s>
Tetris	B-Application
gained	O
greater	O
success	O
with	O
the	O
release	O
of	O
Nintendo	O
's	O
NES	B-Application
version	I-Application
and	O
Game	B-Application
Boy	I-Application
version	I-Application
in	O
1989	O
.	O
</s>
<s>
In	O
six	O
months	O
of	O
release	O
by	O
1990	O
,	O
the	O
NES	B-Application
version	I-Application
sold	O
copies	O
for	O
(	O
adjusted	O
for	O
inflation	O
)	O
,	O
while	O
Game	B-Device
Boy	I-Device
bundles	O
with	O
Tetris	B-Application
sold	O
units	O
.	O
</s>
<s>
Tetris	B-Application
became	O
Nintendo	O
's	O
top-seller	O
for	O
the	O
first	O
few	O
months	O
of	O
1990	O
.	O
</s>
<s>
Nintendo	O
's	O
versions	O
of	O
Tetris	B-Application
sold	O
copies	O
in	O
the	O
United	O
States	O
by	O
1992	O
,	O
and	O
more	O
than	O
worldwide	O
by	O
1996	O
.	O
</s>
<s>
Nintendo	O
eventually	O
sold	O
a	O
total	O
of	O
copies	O
for	O
the	O
Game	B-Device
Boy	I-Device
,	O
and	O
for	O
the	O
NES	O
.	O
</s>
<s>
Sega	O
's	O
arcade	O
version	O
of	O
Tetris	B-Application
was	O
successful	O
in	O
Japan	O
,	O
where	O
it	O
became	O
the	O
highest-grossing	O
arcade	O
game	B-Application
of	I-Application
1989	I-Application
.	O
</s>
<s>
Spectrum	O
HoloByte	O
's	O
PC	O
versions	O
of	O
Tetris	B-Application
sold	O
more	O
than	O
copies	O
,	O
with	O
women	O
accounting	O
for	O
nearly	O
half	O
of	O
Tetris	B-Application
players	O
,	O
in	O
contrast	O
to	O
most	O
other	O
PC	O
games	O
.	O
</s>
<s>
In	O
January	O
2010	O
,	O
the	O
Tetris	B-Application
franchise	O
had	O
sold	O
more	O
than	O
170	O
million	O
copies	O
,	O
including	O
approximately	O
70	O
million	O
physical	O
copies	O
and	O
over	O
100	O
million	O
copies	O
for	B-Application
cell	I-Application
phones	I-Application
,	O
making	O
it	O
one	O
of	O
the	O
best-selling	B-Application
video	I-Application
game	I-Application
franchises	I-Application
of	I-Application
all	I-Application
time	I-Application
.	O
</s>
<s>
,	O
Tetris	B-Application
has	O
sold	O
132million	O
paid	O
mobile	B-Application
game	I-Application
downloads	O
.	O
</s>
<s>
In	O
1993	O
,	O
the	O
ZX	B-Operating_System
Spectrum	I-Operating_System
version	O
of	O
the	O
game	O
was	O
voted	O
number	O
49	O
in	O
the	O
Your	O
Sinclair	O
Official	O
Top	O
100	O
Games	O
of	O
All	O
Time	O
.	O
</s>
<s>
In	O
1996	O
,	O
Tetris	B-Application
Pro	O
was	O
ranked	O
the	O
38th	O
best	O
game	O
of	O
all	O
time	O
by	O
Amiga	B-Device
Power.Amiga	O
Power	O
magazine	O
issue	O
64	O
,	O
Future	O
Publishing	O
,	O
August	O
1996	O
Entertainment	O
Weekly	O
picked	O
the	O
game	O
as	O
the	O
#8	O
greatest	O
game	O
available	O
in	O
1991	O
,	O
saying	O
:	O
"	O
Thanks	O
to	O
Nintendo	O
's	O
endless	O
promotion	O
,	O
Tetris	B-Application
has	O
become	O
one	O
of	O
the	O
most	O
popular	O
video	O
games	O
"	O
.Computer	O
Gaming	O
World	O
gave	O
Tetris	B-Application
the	O
1989	O
Compute	O
!	O
</s>
<s>
In	O
1995	O
,	O
Flux	O
magazine	O
ranked	O
Tetris	B-Application
30th	O
on	O
their	O
Top	O
100	O
Video	O
Games	O
.	O
</s>
<s>
That	O
same	O
year	O
,	O
Next	O
Generation	O
listed	O
it	O
as	O
number	O
2	O
on	O
their	O
"	O
Top	O
100	O
Games	O
of	O
All	O
Time	O
"	O
,	O
commenting	O
that	O
"	O
there	O
is	O
something	O
so	O
perfect	O
,	O
so	O
Zen	B-Application
about	O
the	O
falling	O
blocks	O
of	O
Tetris	B-Application
that	O
the	O
game	O
has	O
captured	O
the	O
interest	O
of	O
everyone	O
who	O
has	O
ever	O
played	O
it	O
"	O
.	O
</s>
<s>
In	O
1999	O
,	O
Next	O
Generation	O
listed	O
Tetris	B-Application
as	O
number	O
2	O
on	O
their	O
"	O
Top	O
50	O
Games	O
of	O
All	O
Time	O
"	O
,	O
commenting	O
that	O
"	O
Tetris	B-Application
is	O
the	O
essence	O
of	O
gameplay	O
at	O
its	O
most	O
basic	O
.	O
</s>
<s>
On	O
March	O
12	O
,	O
2007	O
,	O
The	O
New	O
York	O
Times	O
reported	O
that	O
Tetris	B-Application
was	O
named	O
to	O
a	O
list	O
of	O
the	O
ten	O
most	O
important	O
video	O
games	O
of	O
all	O
time	O
,	O
the	O
so-called	O
game	O
canon	O
.	O
</s>
<s>
After	O
announced	O
at	O
the	O
2007	O
Game	O
Developers	O
Conference	O
,	O
the	O
Library	O
of	O
Congress	O
took	O
up	O
the	O
video	O
game	O
preservation	O
proposal	O
and	O
began	O
with	O
these	O
10	O
games	O
,	O
including	O
Tetris	B-Application
.	O
</s>
<s>
The	O
L-shaped	O
Tetris	B-Application
piece	O
(	O
or	O
"	O
L-Block	O
"	O
as	O
it	O
was	O
called	O
)	O
entered	O
the	O
contest	O
as	O
a	O
joke	O
character	O
,	O
but	O
on	O
November	O
4	O
,	O
it	O
won	O
the	O
contest	O
.	O
</s>
<s>
On	O
June	O
6	O
,	O
2009	O
,	O
Google	B-Application
honored	O
Tetris	B-Application
25-year	O
anniversary	O
by	O
changing	O
its	O
logotype	O
to	O
a	O
version	O
drawn	O
with	O
Tetris	B-Application
blocks	O
–	O
the	O
"	O
l	O
"	O
letter	O
being	O
the	O
long	O
Tetris	B-Application
block	O
lowering	O
into	O
its	O
place	O
,	O
seen	O
here	O
.	O
</s>
<s>
In	O
2009	O
,	O
Game	O
Informer	O
put	O
Tetris	B-Application
3rd	O
on	O
their	O
list	O
of	O
"	O
The	O
Top	O
200	O
Games	O
of	O
All	O
Time	O
"	O
,	O
saying	O
that	O
"	O
if	O
a	O
game	O
could	O
be	O
considered	O
ageless	O
,	O
it	O
's	O
Tetris	B-Application
"	O
.	O
</s>
<s>
The	O
Game	O
Informer	O
staff	O
also	O
placed	O
it	O
third	O
on	O
their	O
2001	O
list	O
of	O
the	O
100	O
best	O
games	O
ever.Electronic	O
Gaming	O
Monthlys	O
100th	O
issue	O
had	O
Tetris	B-Application
as	O
first	O
place	O
in	O
the	O
"	O
100	O
Best	O
Games	O
of	O
All	O
Time	O
"	O
,	O
commenting	O
that	O
"	O
Tetris	B-Application
is	O
as	O
pure	O
as	O
a	O
video	O
game	O
can	O
get	O
.	O
</s>
<s>
Tetris	B-Application
was	O
also	O
the	O
only	O
game	O
for	O
which	O
the	O
list	O
did	O
not	O
specify	O
one	O
or	O
two	O
versions	O
;	O
the	O
editors	O
explained	O
that	O
after	O
deadlocking	O
over	O
which	O
version	O
was	O
best	O
,	O
they	O
concluded	O
that	O
there	O
was	O
no	O
wrong	O
version	O
of	O
Tetris	B-Application
to	O
play	O
.	O
</s>
<s>
In	O
2007	O
,	O
Tetris	B-Application
came	O
in	O
second	O
place	O
in	O
IGN	O
's	O
"	O
100	O
Greatest	O
Video	O
Games	O
of	O
All	O
Time	O
"	O
.	O
</s>
<s>
In	O
1991	O
,	O
PC	O
Format	O
named	O
Tetris	B-Application
one	O
of	O
the	O
50	O
best	O
computer	O
games	O
ever	O
.	O
</s>
<s>
In	O
2015	O
,	O
The	O
Strong	O
National	O
Museum	O
of	O
Play	O
inducted	O
Tetris	B-Application
to	O
its	O
World	O
Video	O
Game	O
Hall	O
of	O
Fame	O
.	O
</s>
<s>
Research	O
Tetris	B-Application
has	O
been	O
the	O
subject	O
of	O
academic	O
research	O
.	O
</s>
<s>
Vladimir	O
Pokhilko	O
was	O
the	O
first	O
clinical	O
psychologist	O
to	O
conduct	O
experiments	O
using	O
Tetris	B-Application
.	O
</s>
<s>
During	O
the	O
game	O
of	O
Tetris	B-Application
,	O
blocks	O
appear	O
to	O
adsorb	O
onto	O
the	O
lower	O
surface	O
of	O
the	O
window	O
.	O
</s>
<s>
Film	O
Tetris	B-Application
appeared	O
in	O
the	O
2010	O
short	O
animated	O
film	O
Pixels	O
,	O
and	O
in	O
the	O
2015	O
movie	O
of	O
the	O
same	O
name	O
inspired	O
by	O
the	O
former	O
.	O
</s>
<s>
In	O
2014	O
it	O
was	O
announced	O
that	O
Threshold	O
Entertainment	O
had	O
teamed	O
up	O
with	O
the	O
Tetris	B-Application
Company	O
to	O
develop	O
Tetris	B-Application
-	O
The	O
Movie	O
,	O
a	O
film	O
adaptation	O
of	O
the	O
game	O
.	O
</s>
<s>
A	O
movie	O
titled	O
Tetris	B-Application
,	O
about	O
the	O
legal	O
battle	O
surrounding	O
the	O
game	O
in	O
the	O
late	O
1980s	O
,	O
was	O
announced	O
in	O
2020	O
,	O
to	O
star	O
Taron	O
Egerton	O
as	O
Henk	O
Rogers	O
.	O
</s>
