<s>
Doki	B-Application
Doki	I-Application
Penguin	I-Application
Land	I-Application
is	O
a	O
series	O
of	O
puzzle	O
platform	O
games	O
developed	O
and	O
published	O
by	O
Sega	O
,	O
and	O
which	O
began	O
in	O
1985	O
.	O
</s>
<s>
Originally	O
released	O
in	O
1985	O
for	O
the	O
SG-1000	B-Operating_System
and	O
MSX	B-Operating_System
,	O
it	O
was	O
also	O
among	O
the	O
few	O
games	O
to	O
receive	O
an	O
arcade	O
port	O
running	O
on	O
hardware	O
closely	O
based	O
on	O
the	O
SG-1000	B-Operating_System
.	O
</s>
<s>
The	O
game	O
remains	O
the	O
most	O
widely	O
ported	O
,	O
and	O
has	O
been	O
compiled	O
on	O
the	O
Sega	O
Saturn	O
,	O
various	O
cell	O
phones	O
,	O
and	O
a	O
loose	O
adaptation	O
on	O
the	O
Game	B-Device
Boy	I-Device
by	O
Pony	O
Canyon	O
.	O
</s>
<s>
It	O
was	O
initially	O
released	O
in	O
1991	O
as	O
a	O
downloadable	B-Application
game	I-Application
for	O
the	O
Sega	B-Operating_System
Mega	I-Operating_System
Drive	I-Operating_System
and	O
later	O
compiled	O
on	O
Game	O
no	O
Kanzume	O
Vol	O
.	O
</s>
<s>
2	O
for	O
the	O
Mega	B-Device
CD	I-Device
.	O
</s>
