<s>
Zen	B-Application
Bound	I-Application
is	O
a	O
puzzle	O
game	O
for	O
the	O
iOS	B-Operating_System
,	O
Android	B-Application
,	O
and	O
Maemo	B-Operating_System
platforms	I-Operating_System
(	O
Nokia	B-Application
N900	I-Application
)	O
,	O
developed	O
by	O
Secret	O
Exit	O
.	O
</s>
<s>
It	O
was	O
announced	O
on	O
September	O
5	O
,	O
2008	O
via	O
the	O
company	O
's	O
discussion	B-Application
board	I-Application
,	O
and	O
officially	O
released	O
via	O
the	O
App	B-Application
Store	I-Application
on	O
February	O
24	O
,	O
2009	O
,	O
and	O
via	O
Ovi	B-Application
Store	I-Application
on	O
June	O
16	O
,	O
2010	O
.	O
</s>
<s>
A	O
port	O
to	O
Android	B-Application
was	O
announced	O
as	O
part	O
of	O
the	O
Humble	O
Bundle	O
for	O
Android	B-Application
2	O
on	O
March	O
19	O
,	O
2012	O
.	O
</s>
<s>
A	O
sequel	O
,	O
Zen	B-Application
Bound	I-Application
2	I-Application
,	O
was	O
released	O
for	O
iOS	B-Operating_System
on	O
April	O
1	O
,	O
2010	O
,	O
for	O
Steam	B-Application
on	O
November	O
16	O
,	O
2010	O
,	O
and	O
for	O
the	O
Nintendo	B-Application
Switch	I-Application
in	O
Europe	O
and	O
North	O
America	O
on	O
May	O
24	O
,	O
2018	O
.	O
</s>
<s>
Zen	B-Application
Bound	I-Application
received	O
universal	O
acclaim	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
GameRankings	O
.	O
</s>
<s>
Zen	B-Application
Bound	I-Application
2	I-Application
received	O
"	O
favorable	O
"	O
reviews	O
on	O
all	O
platforms	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
<s>
Neither	O
Zen	B-Application
Bound	I-Application
nor	O
its	O
sequel	O
are	O
available	O
for	O
purchase	O
in	O
the	O
Apple	B-Application
App	I-Application
Store	I-Application
or	O
the	O
Google	O
Play	O
Store	O
;	O
however	O
,	O
Zen	B-Application
Bound	I-Application
2	I-Application
remains	O
available	O
via	O
Steam	B-Application
and	O
the	O
Nintendo	O
eStore	O
as	O
of	O
April	O
2022	O
.	O
</s>
