<s>
Retro	B-Application
Game	I-Application
Challenge	I-Application
2	I-Application
is	O
the	O
sequel	O
to	O
Retro	B-Application
Game	I-Application
Challenge	I-Application
.	O
</s>
<s>
It	O
was	O
developed	O
by	O
indieszero	O
,	O
published	O
by	O
Namco	O
Bandai	O
and	O
released	O
for	O
the	O
Nintendo	B-Device
DS	I-Device
on	O
February	O
26	O
,	O
2009	O
,	O
in	O
Japan	O
,	O
and	O
never	O
saw	O
an	O
official	O
Western	O
release	O
due	O
to	O
low	O
sales	O
of	O
its	O
predecessor	O
.	O
</s>
<s>
Retro	B-Application
Game	I-Application
Challenge	I-Application
2	I-Application
largely	O
consists	O
of	O
NES-styled	O
games	O
reminiscent	O
of	O
actual	O
games	O
released	O
in	O
the	O
late	O
1980s	O
through	O
mid-1990s	O
.	O
</s>
<s>
The	O
game	O
also	O
features	O
games	O
styled	O
after	O
Super	B-Application
NES	I-Application
,	O
Game	B-Device
Boy	I-Device
,	O
Game	B-Device
Boy	I-Device
Color	I-Device
and	O
Famicom	B-Device
Disk	I-Device
System	I-Device
games	O
,	O
as	O
well	O
as	O
variants	O
on	O
games	O
included	O
in	O
Retro	B-Application
Game	I-Application
Challenge	I-Application
and	O
a	O
"	O
game	O
trainer	O
"	O
modeled	O
after	O
a	O
Game	B-Device
&	I-Device
Watch	I-Device
.	O
</s>
<s>
Some	O
of	O
the	O
games	O
include	O
:	O
Wiz-Man	O
,	O
inspired	O
by	O
Pac-Man	B-Application
,	O
Mutekiken	O
Kung	O
Fu	O
,	O
meant	O
to	O
mimic	O
a	O
Western-developed	O
game	O
in	O
the	O
style	O
of	O
Karateka	B-Application
,	O
and	O
Demon	O
Returns	O
,	O
a	O
platformer	O
inspired	O
by	O
both	O
Super	B-Application
Mario	I-Application
Bros	I-Application
.	I-Application
and	O
Ghosts	B-Application
'	I-Application
n	I-Application
Goblins	I-Application
.	O
</s>
<s>
Retro	B-Application
Game	I-Application
Challenge	I-Application
2	I-Application
was	O
the	O
fifth-best-selling	O
game	O
in	O
Japan	O
on	O
the	O
week	O
of	O
its	O
release	O
,	O
selling	O
44,000	O
units	O
.	O
</s>
<s>
Chris	O
Kohler	O
of	O
Wired	O
called	O
the	O
game	O
one	O
of	O
the	O
most	O
brilliant	O
on	O
the	O
Nintendo	B-Device
DS	I-Device
platform	O
and	O
superior	O
to	O
its	O
predecessor	O
,	O
with	O
more	O
varied	O
types	O
of	O
games	O
,	O
lamenting	O
the	O
fact	O
that	O
it	O
was	O
not	O
localized	O
despite	O
the	O
release	O
in	O
the	O
West	O
of	O
"	O
every	O
crappy	O
shovelware	O
piece	O
of	O
lazy	O
trash	O
from	O
here	O
to	O
eternity	O
"	O
.	O
</s>
<s>
An	O
additional	O
,	O
Japan-only	O
entry	O
in	O
the	O
series	O
,	O
Retro	B-Application
Game	I-Application
Challenge	I-Application
3	O
,	O
was	O
later	O
released	O
for	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
.	O
</s>
