<s>
ZZT	B-Application
is	O
a	O
1991	O
action-adventure	O
puzzle	O
video	O
game	O
and	O
game	B-Application
creation	I-Application
system	I-Application
developed	O
and	O
published	O
by	O
Potomac	O
Computer	O
Systems	O
for	O
MS-DOS	B-Application
.	O
</s>
<s>
It	O
was	O
later	O
released	O
as	O
freeware	B-License
in	O
1997	O
.	O
</s>
<s>
It	O
is	O
an	O
early	O
game	O
allowing	O
user-generated	O
content	O
using	O
object-oriented	B-Language
programming	I-Language
.	O
</s>
<s>
It	O
includes	O
an	O
in-game	O
editor	O
,	O
allowing	O
players	O
to	O
develop	O
worlds	O
using	O
the	O
game	O
's	O
scripting	B-Language
language	I-Language
,	O
ZZT-OOP	O
.	O
</s>
<s>
It	O
was	O
built	O
from	O
a	O
text	B-Application
editor	I-Application
conceived	O
in	O
1989	O
to	O
build	O
a	O
better	O
editor	O
for	O
Pascal	B-Application
,	O
after	O
he	O
disliked	O
editors	O
that	O
came	O
with	O
other	O
programming	O
languages	O
.	O
</s>
<s>
Initially	O
,	O
he	O
made	O
the	O
game	O
for	O
himself	O
,	O
but	O
after	O
positive	O
reception	O
from	O
his	O
friends	O
and	O
neighbors	O
,	O
and	O
seeing	O
the	O
potential	O
for	O
making	O
a	O
profit	O
by	O
releasing	O
the	O
game	O
under	O
shareware	B-License
,	O
he	O
released	O
it	O
publicly	O
.	O
</s>
<s>
He	O
marketed	O
the	O
game	O
by	O
distributing	O
it	O
across	O
shareware	B-License
vendors	O
and	O
bulletin	B-Application
board	I-Application
systems	I-Application
,	O
earning	O
money	O
through	O
mail	O
orders	O
for	O
registered	O
worlds	O
.	O
</s>
<s>
ZZT	B-Application
was	O
a	O
commercial	O
success	O
,	O
with	O
around	O
4,000	O
–	O
5,000	O
copies	O
by	O
2009	O
.	O
</s>
<s>
The	O
sequel	O
is	O
Super	O
ZZT	B-Application
(	O
1991	O
)	O
.	O
</s>
<s>
Other	O
ZZT	B-Application
worlds	O
were	O
published	O
later	O
as	O
Best	O
of	O
ZZT	B-Application
(	O
1992	O
)	O
and	O
ZZT	B-Application
's	O
Revenge	O
(	O
1992	O
)	O
.	O
</s>
<s>
ZZTs	B-Application
success	O
led	O
Sweeney	O
to	O
change	O
his	O
company	O
's	O
name	O
to	O
Epic	O
MegaGames	O
,	O
and	O
focus	O
on	O
competing	O
as	O
a	O
video	O
game	O
company	O
using	O
shareware	B-License
to	O
distribute	O
commercial	O
games	O
.	O
</s>
<s>
Epic	O
MegaGames	O
later	O
developed	O
other	O
successful	O
games	O
including	O
Jill	B-Application
of	I-Application
the	I-Application
Jungle	I-Application
(	O
1992	O
)	O
and	O
Unreal	B-Application
(	O
1998	O
)	O
,	O
using	O
lessons	O
from	O
ZZTs	B-Application
success	O
by	O
focusing	O
on	O
developing	O
the	O
editor	O
and	O
engine	O
to	O
allow	O
others	O
to	O
more	O
easily	O
make	O
games	O
.	O
</s>
<s>
The	O
game	O
inspired	O
one	O
of	O
the	O
earliest	O
active	O
modding	B-Device
communities	O
,	O
which	O
has	O
grown	O
by	O
making	O
new	O
worlds	O
,	O
editing	O
tools	O
,	O
and	O
source	O
ports	O
,	O
and	O
inspiring	O
some	O
in	O
the	O
community	O
to	O
pursue	O
a	O
career	O
in	O
the	O
video	O
game	O
industry	O
.	O
</s>
<s>
ZZT	B-Application
is	O
a	O
top-down	O
action-adventure	O
puzzle	O
video	O
game	O
and	O
game	B-Application
creation	I-Application
system	I-Application
.	O
</s>
<s>
One	O
type	O
of	O
object	O
called	O
"	O
Object	O
"	O
interacts	O
based	O
on	O
written	O
scripts	O
using	O
the	O
game	O
's	O
scripting	B-Language
language	I-Language
,	O
ZZT-OOP	O
.	O
</s>
<s>
Town	O
of	O
ZZT	B-Application
starts	O
in	O
a	O
hub	O
world	O
with	O
four	O
buildings	O
mixed	O
with	O
six	O
exits	O
,	O
Caves	O
of	O
ZZT	B-Application
opens	O
with	O
a	O
sparse	O
area	O
of	O
torches	O
and	O
a	O
scroll	O
,	O
Dungeons	O
of	O
ZZT	B-Application
starts	O
with	O
a	O
linear	O
opening	O
sequence	O
with	O
gates	O
that	O
lock	O
the	O
player	O
inside	O
,	O
and	O
City	O
of	O
ZZT	B-Application
opens	O
with	O
a	O
city	O
street	O
as	O
a	O
hub	O
with	O
a	O
few	O
structures	O
.	O
</s>
<s>
Guided	O
Tour	O
ZZT	B-Application
's	O
Other	O
Worlds	O
previews	O
boards	O
of	O
each	O
game	O
worlds	O
,	O
and	O
Demo	O
of	O
the	O
ZZT	B-Application
World	O
Editor	O
creates	O
parallels	O
to	O
a	O
museum	O
by	O
showing	O
all	O
of	O
the	O
items	O
,	O
terrains	O
,	O
and	O
creatures	O
that	O
make	O
up	O
ZZT	B-Application
.	O
</s>
<s>
ZZT	B-Application
includes	O
an	O
in-game	O
editor	O
,	O
allowing	O
players	O
to	O
make	O
their	O
own	O
worlds	O
.	O
</s>
<s>
Using	O
ZZT-OOP	O
,	O
objects	O
can	O
be	O
named	O
,	O
given	O
commands	O
for	O
actions	O
,	O
and	O
can	O
send	O
and	O
receive	O
messages	O
.	O
</s>
<s>
Everything	O
within	O
ZZT	B-Application
is	O
displayed	O
in	O
the	O
255	O
characters	O
of	O
the	O
IBM	O
PC	O
's	O
character	O
set	O
to	O
create	O
environments	O
.	O
</s>
<s>
The	O
PC	B-Device
speaker	I-Device
permits	O
seven	O
notes	O
at	O
several	O
different	O
octaves	O
,	O
and	O
instruments	O
with	O
unique	O
pitches	O
of	O
clicks	O
,	O
pops	O
,	O
and	O
snaps	O
to	O
represent	O
percussion	O
.	O
</s>
<s>
Video	O
game	O
programmer	O
Tim	O
Sweeney	O
,	O
studying	O
mechanical	O
engineering	O
at	O
the	O
University	O
of	O
Maryland	O
,	O
first	O
developed	O
ZZT	B-Application
as	O
a	O
text	B-Application
editor	I-Application
in	O
Turbo	B-Application
Pascal	I-Application
.	O
</s>
<s>
During	O
this	O
time	O
,	O
Tim	O
did	O
not	O
know	O
how	O
to	O
program	O
graphics	O
and	O
only	O
had	O
a	O
286	B-General_Concept
computer	O
and	O
a	O
Model	B-Device
M	I-Device
keyboard	I-Device
.	O
</s>
<s>
The	O
text	B-Application
editor	I-Application
idea	O
came	O
from	O
disliking	O
the	O
included	O
editors	O
for	O
the	O
programming	O
languages	O
he	O
tried	O
on	O
his	O
PC	O
.	O
</s>
<s>
Instead	O
he	O
wanted	O
to	O
recreate	O
his	O
previously	O
made	O
Pascal-like	O
programming	O
environment	O
for	O
the	O
Apple	B-Device
II	I-Device
.	O
</s>
<s>
From	O
there	O
,	O
he	O
designed	O
his	O
first	O
levels	O
from	O
text	O
files	O
,	O
creating	O
different	O
boards	O
similar	O
in	O
style	O
to	O
Atari	O
's	O
Adventure	B-Application
,	O
while	O
continually	O
offering	O
additions	O
to	O
the	O
game	O
and	O
editor	O
.	O
</s>
<s>
Most	O
of	O
these	O
additions	O
were	O
his	O
own	O
,	O
but	O
he	O
occasionally	O
took	O
ideas	O
from	O
Kroz	B-Application
,	O
such	O
as	O
the	O
bomb	O
.	O
</s>
<s>
Development	O
took	O
around	O
six	O
to	O
nine	O
months	O
,	O
with	O
under	O
1,000	O
hours	O
of	O
time	O
spent	O
developing	O
the	O
game	O
,	O
and	O
making	O
around	O
20,000	O
lines	O
of	O
Pascal	B-Application
code	O
.	O
</s>
<s>
The	O
game	O
's	O
episodic	O
model	O
took	O
inspiration	O
from	O
Apogee	O
's	O
shareware	B-License
model	O
,	O
and	O
he	O
encouraged	O
spreading	O
the	O
game	O
across	O
shareware	B-License
vendors	O
,	O
user	O
groups	O
,	O
and	O
bulletin	B-Application
board	I-Application
systems	I-Application
.	O
</s>
<s>
He	O
operated	O
his	O
company	O
out	O
of	O
his	O
bedroom	O
,	O
having	O
orders	O
sent	O
to	O
his	O
parents	O
 '	O
address	O
,	O
where	O
he	O
would	O
send	O
the	O
remaining	O
episodes	O
on	O
floppy	B-Device
disks	I-Device
by	O
mail	O
delivery	O
.	O
</s>
<s>
Sweeney	O
chose	O
the	O
name	O
so	O
it	O
would	O
be	O
listed	O
last	O
alphabetically	O
in	O
shareware	B-License
catalogs	O
and	O
on	O
bulletin	B-Application
board	I-Application
systems	I-Application
,	O
though	O
a	O
fan	O
later	O
suggested	O
the	O
backronym	O
of	O
"	O
Zoo	O
of	O
Zero	O
Tolerance	O
"	O
,	O
which	O
Sweeney	O
endorsed	O
.	O
</s>
<s>
He	O
sold	O
it	O
as	O
the	O
first	O
major	O
game	O
with	O
object-oriented	B-Language
programming	I-Language
.	O
</s>
<s>
ZZT	B-Application
was	O
released	O
on	O
January	O
15	O
,	O
1991	O
.	O
</s>
<s>
Town	O
of	O
ZZT	B-Application
alongside	O
the	O
in-game	O
editor	O
was	O
distributed	O
freely	O
,	O
while	O
the	O
other	O
official	O
worlds	O
could	O
be	O
ordered	O
to	O
receive	O
a	O
single	O
floppy	B-Device
disk	I-Device
including	O
the	O
purchased	O
worlds	O
,	O
and	O
drawn	O
maps	O
of	O
each	O
of	O
the	O
worlds	O
.	O
</s>
<s>
At	O
one	O
point	O
,	O
City	O
of	O
ZZT	B-Application
was	O
also	O
distributed	O
as	O
ZZT	B-Application
's	O
City	O
,	O
through	O
Softdisk	O
's	O
On	O
Disk	O
Monthly	O
service	O
.	O
</s>
<s>
Each	O
of	O
the	O
remaining	O
official	O
worlds	O
,	O
along	O
with	O
other	O
ZZT	B-Application
games	O
were	O
later	O
released	O
as	O
freeware	B-License
on	O
October	O
10	O
,	O
1997	O
.	O
</s>
<s>
Following	O
ZZTs	B-Application
release	O
,	O
about	O
three	O
to	O
four	O
copies	O
were	O
sold	O
daily	O
,	O
at	O
around	O
800	O
copies	O
by	O
November	O
1991	O
,	O
and	O
around	O
4,000	O
to	O
5,000	O
copies	O
in	O
total	O
by	O
2009	O
.	O
</s>
<s>
Sweeney	O
earned	O
around	O
per	O
day	O
by	O
November	O
1991	O
,	O
and	O
around	O
from	O
ZZT	B-Application
by	O
May	O
1999	O
,	O
of	O
which	O
most	O
of	O
the	O
profit	O
came	O
from	O
its	O
first	O
year	O
.	O
</s>
<s>
After	O
Sweeney	O
moved	O
out	O
of	O
his	O
parents	O
 '	O
house	O
to	O
establish	O
proper	O
corporate	O
headquarters	O
for	O
Potomac	O
Computer	O
Systems	O
,	O
then	O
renamed	O
Epic	O
MegaGames	O
,	O
his	O
father	O
Paul	O
Sweeney	O
,	O
continued	O
fulfilling	O
mail	O
orders	O
to	O
the	O
original	O
address	O
under	O
the	O
Epic	O
Classics	O
label	O
,	O
allowing	O
for	O
purchase	O
of	O
physical	O
copies	O
of	O
ZZT	B-Application
.	O
</s>
<s>
The	O
final	O
copy	O
of	O
ZZT	B-Application
was	O
shipped	O
to	O
game	O
designer	O
Zack	O
Hiwiller	O
in	O
November	O
2013	O
.	O
</s>
<s>
A	O
comment	O
from	O
Computer	O
Gaming	O
World	O
billed	O
ZZT	B-Application
as	O
"	O
truly	O
charming	O
"	O
,	O
finding	O
the	O
gameplay	O
simple	O
to	O
learn	O
.	O
</s>
<s>
Scott	O
Wolf	O
of	O
PC	O
Gamer	O
(	O
US	O
)	O
stated	O
the	O
graphics	O
and	O
sound	O
for	O
ZZT	B-Application
to	O
be	O
"	O
truly	O
awful	O
"	O
,	O
while	O
the	O
gameplay	O
serves	O
as	O
a	O
flashback	O
to	O
"	O
when	O
gameplay	O
was	O
not	O
overshadowed	O
by	O
flashy	O
video	O
and	O
animation	O
"	O
.	O
</s>
<s>
Benj	O
Edwards	O
has	O
called	O
ZZT	B-Application
an	O
"	O
influential	O
and	O
underrated	O
game	O
"	O
,	O
crediting	O
its	O
current	O
enjoyment	O
from	O
playing	O
community	O
made	O
worlds	O
and	O
making	O
unexpected	O
things	O
with	O
the	O
"	O
fairly	O
robust	O
"	O
built	O
in	O
editor	O
.	O
</s>
<s>
This	O
is	O
while	O
crediting	O
the	O
official	O
worlds	O
for	O
being	O
a	O
"	O
depthy	O
adventure	B-Application
game	O
full	O
of	O
puzzles	O
,	O
challenge	O
,	O
and	O
humor	O
"	O
.	O
</s>
<s>
Chris	O
Kohler	O
of	O
Wired	O
called	O
it	O
a	O
simple	O
,	O
fun	O
,	O
and	O
not	O
always	O
intuitive	O
game	O
design	O
tool	O
under	O
the	O
façade	O
of	O
a	O
simple	O
adventure	B-Application
game	O
,	O
blending	O
seamless	O
game	O
design	O
and	O
play	O
that	O
makes	O
it	O
attractive	O
and	O
user-friendly	O
.	O
</s>
<s>
He	O
wrote	O
that	O
though	O
ZZT-OOP	O
was	O
basic	O
and	O
limited	O
,	O
children	O
could	O
learn	O
about	O
and	O
make	O
games	O
without	O
knowing	O
anything	O
about	O
programming	O
.	O
</s>
<s>
Hardcore	O
Gaming	O
101	O
in	O
a	O
podcast	O
episode	O
stated	O
ZZT	B-Application
was	O
"	O
not	O
all	O
that	O
fun	O
"	O
,	O
criticizing	O
that	O
official	O
worlds	O
and	O
community	O
made	O
worlds	O
included	O
unavoidable	O
damage	O
,	O
and	O
instant	O
death	O
.	O
</s>
<s>
Rather	O
,	O
they	O
admired	O
ZZT	B-Application
like	O
a	O
science	O
experiment	O
or	O
a	O
demo	O
from	O
a	O
demoscene	O
,	O
existing	O
to	O
study	O
and	O
push	O
the	O
limits	O
of	O
ZZT	B-Application
,	O
finding	O
the	O
game	O
itself	O
and	O
the	O
community	O
that	O
built	O
from	O
it	O
technically	O
impressive	O
.	O
</s>
<s>
By	O
getting	O
$100	O
per	O
day	O
from	O
ZZT	B-Application
,	O
Sweeney	O
was	O
convinced	O
he	O
could	O
earn	O
enough	O
from	O
the	O
shareware	B-License
industry	O
,	O
and	O
decided	O
to	O
work	O
in	O
the	O
video	O
game	O
industry	O
.	O
</s>
<s>
Shortly	O
after	O
the	O
release	O
of	O
ZZT	B-Application
,	O
Sweeney	O
started	O
a	O
level	O
designer	O
contest	O
for	O
registered	O
users	O
to	O
make	O
their	O
own	O
worlds	O
and	O
submit	O
them	O
to	O
him	O
.	O
</s>
<s>
The	O
best	O
collaboration	O
games	O
that	O
won	O
the	O
contest	O
were	O
included	O
in	O
The	O
Best	O
of	O
ZZT	B-Application
and	O
ZZT	B-Application
's	O
Revenge	O
,	O
released	O
in	O
1992	O
.	O
</s>
<s>
The	O
six	O
winning	O
custom	O
worlds	O
that	O
made	O
up	O
ZZT	B-Application
's	O
Revenge	O
earned	O
the	O
designers	O
employment	O
in	O
Epic	O
MegaGames	O
,	O
with	O
the	O
winning	O
worlds	O
being	O
"	O
Ezanya	O
"	O
,	O
"	O
Fantasy	O
"	O
,	O
"	O
Crypt	O
"	O
,	O
"	O
Smiley	O
Guy	O
"	O
,	O
"	O
Manor	O
"	O
,	O
and	O
"	O
Darbytown	O
"	O
.	O
</s>
<s>
Sweeney	O
later	O
asked	O
one	O
of	O
these	O
developers	O
,	O
Allen	O
Pilgrim	O
,	O
to	O
create	O
the	O
shareware	B-License
world	O
"	O
Monster	O
Zoo	O
"	O
for	O
the	O
sequel	O
to	O
ZZT	B-Application
,	O
Super	O
ZZT	B-Application
,	O
released	O
on	O
October	O
15	O
,	O
1991	O
.	O
</s>
<s>
The	O
game	O
plays	O
similarly	O
to	O
ZZT	B-Application
,	O
while	O
adding	O
more	O
features	O
such	O
as	O
greater	O
colors	O
accessible	O
within	O
its	O
editor	O
,	O
new	O
enemies	O
and	O
objects	O
,	O
and	O
scrolling	O
map	O
screens	O
that	O
allowed	O
for	O
larger	O
boards	O
than	O
in	O
ZZT	B-Application
.	O
</s>
<s>
Although	O
Super	O
ZZT	B-Application
incorporated	O
several	O
additions	O
to	O
ZZT	B-Application
,	O
it	O
never	O
caught	O
on	O
with	O
the	O
ZZT	B-Application
community	O
like	O
the	O
original	O
ZZT	B-Application
did	O
,	O
and	O
very	O
few	O
games	O
were	O
ever	O
created	O
for	O
Super	O
ZZT	B-Application
,	O
with	O
one	O
reason	O
being	O
due	O
to	O
the	O
editor	O
being	O
hidden	O
during	O
normal	O
play	O
.	O
</s>
<s>
After	O
publishing	O
Best	O
of	O
ZZT	B-Application
and	O
ZZT	B-Application
's	O
Revenge	O
,	O
Sweeney	O
realized	O
the	O
community	O
began	O
creating	O
worlds	O
that	O
reached	O
or	O
exceeded	O
the	O
quality	O
of	O
his	O
work	O
.	O
</s>
<s>
Furthermore	O
,	O
he	O
believed	O
that	O
games	O
with	O
cutting	O
edge	O
graphics	O
and	O
sound	O
similar	O
in	O
commercial	O
quality	O
to	O
Super	B-Application
Nintendo	I-Application
Entertainment	I-Application
System	I-Application
or	O
Sega	B-Operating_System
Genesis	I-Operating_System
games	O
would	O
have	O
higher	O
sales	O
in	O
the	O
shareware	B-License
model	O
,	O
taking	O
influence	O
from	O
Commander	B-Application
Keen	I-Application
and	O
Duke	B-Application
Nukem	I-Application
.	O
</s>
<s>
As	O
such	O
,	O
he	O
moved	O
away	O
from	O
ZZT	B-Application
indefinitely	O
to	O
work	O
on	O
other	O
projects	O
like	O
Jill	B-Application
of	I-Application
the	I-Application
Jungle	I-Application
.	O
</s>
<s>
He	O
has	O
commented	O
on	O
wanting	O
to	O
build	O
a	O
massive-multiplayer	B-Application
online	I-Application
version	O
of	O
ZZT	B-Application
during	O
an	O
interview	O
,	O
but	O
his	O
future	O
focus	O
on	O
the	O
company	O
was	O
to	O
move	O
forward	O
with	O
new	O
franchises	O
,	O
while	O
learning	O
from	O
the	O
success	O
of	O
ZZT	B-Application
.	O
</s>
<s>
Sweeney	O
and	O
Mark	O
Rein	O
later	O
credited	O
that	O
much	O
of	O
the	O
core	O
idea	O
of	O
Unreal	B-Application
and	O
Unreal	B-Operating_System
Engine	I-Operating_System
came	O
from	O
what	O
Sweeney	O
learned	O
from	O
the	O
success	O
of	O
ZZT	B-Application
,	O
with	O
a	O
focus	O
on	O
building	O
games	O
with	O
clean	O
code	O
and	O
editing	O
tools	O
,	O
so	O
that	O
others	O
can	O
build	O
their	O
own	O
games	O
.	O
</s>
<s>
Mark	O
Rein	O
has	O
claimed	O
that	O
Unreal	B-Operating_System
Tournament	I-Operating_System
became	O
a	O
spiritual	O
successor	O
to	O
the	O
game	O
thanks	O
to	O
the	O
game	O
's	O
modding	B-Device
community	O
and	O
versatile	O
developer	O
tools	O
.	O
</s>
<s>
An	O
early	O
modding	B-Device
community	O
emerged	O
within	O
Prodigy	O
,	O
America	O
Online	O
,	O
Compuserve	O
,	O
and	O
the	O
Internet	O
.	O
</s>
<s>
Many	O
fan-made	O
worlds	O
and	O
editing	O
tools	O
are	O
curated	O
on	O
a	O
fan	O
website	O
,	O
Museum	O
of	O
ZZT	B-Application
.	O
</s>
<s>
Tim	O
Sweeney	O
has	O
claimed	O
that	O
tens	O
of	O
thousands	O
of	O
workers	O
in	O
the	O
game	O
industry	O
have	O
previously	O
made	O
worlds	O
in	O
ZZT	B-Application
.	O
</s>
<s>
A	O
port	O
called	O
Zeta	O
allows	O
for	O
playing	O
ZZT	B-Application
games	O
on	O
Windows	O
or	O
a	O
web	O
browser	O
,	O
and	O
another	O
source	O
port	O
,	O
DreamZZT	O
,	O
allows	O
ports	O
to	O
consoles	O
,	O
specifically	O
the	B-Operating_System
Dreamcast	I-Operating_System
and	O
Nintendo	B-Device
DS	I-Device
.	O
</s>
<s>
Worlds	O
continue	O
to	O
be	O
developed	O
that	O
have	O
expanded	O
beyond	O
its	O
intended	O
genre	O
,	O
creating	O
shoot	O
'	O
em	O
ups	O
,	O
falling	B-Device
block	I-Device
puzzle	I-Device
games	I-Device
,	O
complex	O
role-playing	O
games	O
,	O
and	O
point-and-click	O
adventure	B-Application
games	O
,	O
sometimes	O
deriving	O
from	O
other	O
entertainment	O
releases	O
.	O
</s>
<s>
The	O
source	O
code	O
of	O
ZZT	B-Application
was	O
lost	O
in	O
a	O
computer	B-General_Concept
crash	I-General_Concept
,	O
a	O
community	O
developer	O
,	O
Adrian	O
Siekierka	O
,	O
reconstructed	O
and	O
released	O
the	O
source	O
code	O
in	O
2020	O
,	O
creating	O
a	O
binary	O
accurate	O
executable	O
of	O
ZZT	B-Application
with	O
Sweeney	O
's	O
permission	O
.	O
</s>
<s>
On	O
January	O
28	O
,	O
2023	O
,	O
the	O
original	O
source	O
code	O
for	O
ZZT	B-Application
3.0	O
(	O
without	O
third	O
party	O
content	O
)	O
was	O
uploaded	O
to	O
GitHub	B-Application
under	O
the	B-License
MIT	I-License
License	I-License
with	O
permission	O
of	O
Tim	O
Sweeney	O
.	O
</s>
<s>
Other	O
games	O
have	O
been	O
inspired	O
by	O
ZZT	B-Application
,	O
such	O
as	O
MegaZeux	O
,	O
PuzzleScript	O
,	O
and	O
Frog	B-Application
Fractions	I-Application
2	I-Application
,	O
and	O
authors	O
of	O
ZZT	B-Application
worlds	O
became	O
professional	O
video	O
game	O
developers	O
.	O
</s>
<s>
Rock	O
Paper	O
Shotgun	O
has	O
made	O
comparisons	O
to	O
Minecraft	B-Application
and	O
Roblox	B-Protocol
,	O
in	O
its	O
ability	O
to	O
serve	O
as	O
a	O
start	O
for	O
new	O
video	O
game	O
developers	O
.	O
</s>
<s>
Wired	O
and	O
Hardcore	O
Gaming	O
101	O
found	O
similarities	O
in	O
its	O
seamless	O
blend	O
of	O
gameplay	O
and	O
editing	O
to	O
LittleBigPlanet	B-Application
.	O
</s>
