<s>
Sudoku	O
is	O
a	O
sudoku	O
puzzle	O
game	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
,	O
released	O
in	O
Europe	O
on	O
December	O
2	O
,	O
2005	O
and	O
North	O
America	O
on	O
March	O
21	O
,	O
2006	O
.	O
</s>
<s>
Many	O
players	O
as	O
well	O
as	O
professional	O
reviewers	O
have	O
reported	O
a	O
major	O
glitch	O
in	O
the	O
PSP	B-Operating_System
title	O
,	O
in	O
which	O
a	O
mysterious	O
message	O
dialog	O
pops	O
up	O
at	O
semi-regular	O
intervals	O
throughout	O
the	O
game	O
.	O
</s>
<s>
However	O
,	O
there	O
are	O
reports	O
that	O
keeping	O
the	O
PSP	B-Operating_System
fully	O
charged	O
and	O
playing	O
the	O
game	O
with	O
the	O
charger	O
plugged	O
in	O
minimizes	O
the	O
bug	O
's	O
occurrence	O
.	O
</s>
<s>
Sudoku	O
was	O
also	O
released	O
on	O
the	O
PlayStation	O
Network	O
(	O
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
as	O
an	O
initial	O
Starter	O
Pack	O
with	O
12	O
puzzles	O
,	O
with	O
a	O
level	O
pack	O
of	O
more	O
than	O
1200	O
puzzles	O
.	O
</s>
