<s>
Tetris	B-Operating_System
Friends	I-Operating_System
was	O
an	O
online	O
Tetris	B-Device
game	O
developed	O
by	O
Tetris	B-Device
Online	O
,	O
Inc	O
.	O
</s>
<s>
It	O
was	O
the	O
only	O
official	O
Flash	O
implementation	O
of	O
Tetris	B-Device
made	O
by	O
the	O
Tetris	B-Device
company	O
itself	O
.	O
</s>
<s>
At	O
the	O
time	O
,	O
it	O
was	O
also	O
the	O
only	O
official	O
Tetris	B-Device
platform	O
that	O
had	O
advertisements	O
play	O
before	O
a	O
match	O
.	O
</s>
<s>
Tetris	B-Operating_System
Friends	I-Operating_System
had	O
over	O
a	O
million	O
registered	O
users	O
.	O
</s>
<s>
Tetris	B-Operating_System
Friends	I-Operating_System
featured	O
six	O
single-player	O
modes	O
and	O
five	O
multiplayer	O
modes	O
.	O
</s>
<s>
All	O
game	O
modes	O
except	O
Tetris	B-Device
1989	O
and	O
N-Blox	O
used	O
the	O
SRS	O
rotational	O
system	O
,	O
featured	O
the	O
hold	O
function	O
which	O
allowed	O
players	O
to	O
save	O
a	O
block	O
for	O
future	O
use	O
,	O
and	O
had	O
a	O
quad-Tetrimino	O
preview	O
that	O
allows	O
players	O
to	O
see	O
the	O
next	O
few	O
upcoming	O
blocks	O
.	O
</s>
<s>
Tetris	B-Device
Online	O
,	O
Inc	O
ceased	O
all	O
operations	O
on	O
May	O
30	O
,	O
2019	O
.	O
</s>
<s>
As	O
such	O
,	O
Tetris	B-Operating_System
Friends	I-Operating_System
permanently	O
shut	O
down	O
on	O
that	O
date	O
.	O
</s>
<s>
This	O
mode	O
attempts	O
to	O
simulate	O
the	O
classic	O
Game	O
Boy	O
version	O
of	O
Tetris	B-Device
.	O
</s>
<s>
This	O
is	O
similar	O
to	O
other	O
standard	O
Tetris	B-Device
modes	O
available	O
in	O
other	O
games	O
.	O
</s>
<s>
This	O
mode	O
is	O
similar	O
to	O
the	O
N-Blox	O
and	O
Tetris	B-Device
1989	O
modes	O
.	O
</s>
<s>
This	O
game	O
is	O
a	O
remake	O
of	O
the	O
first	O
Tetris	B-Device
game	O
that	O
was	O
released	O
on	O
Facebook	O
.	O
</s>
<s>
It	O
is	O
only	O
available	O
to	O
play	O
on	O
Facebook	O
,	O
and	O
is	O
not	O
found	O
on	O
the	O
Tetris	B-Operating_System
Friends	I-Operating_System
website	O
.	O
</s>
<s>
Tetris	B-Operating_System
Friends	I-Operating_System
met	O
with	O
positive	O
reviews	O
overall	O
.	O
</s>
<s>
On	O
April	O
25	O
,	O
2019	O
,	O
a	O
banner	O
appeared	O
on	O
the	O
homepage	O
of	O
Tetris	B-Operating_System
Friends	I-Operating_System
stating	O
that	O
"	O
Tetris	B-Operating_System
Friends	I-Operating_System
will	O
no	O
longer	O
be	O
available	O
after	O
May	O
31st	O
,	O
2019.	O
"	O
</s>
<s>
This	O
coincided	O
with	O
the	O
shutdown	O
of	O
Tetris	B-Device
Online	O
,	O
Inc	O
(	O
the	O
platform	O
's	O
parent	O
company	O
)	O
.	O
</s>
<s>
On	O
May	O
31	O
,	O
2019	O
,	O
Tetris	B-Operating_System
Friends	I-Operating_System
permanently	O
shut	O
down	O
alongside	O
Tetris	B-Device
Online	O
,	O
Inc	O
.	O
</s>
