<s>
Superman	B-Device
Returns	I-Device
:	I-Device
Fortress	I-Device
of	I-Device
Solitude	I-Device
is	O
a	O
puzzle	O
video	O
game	O
,	O
for	O
the	O
Game	B-Device
Boy	I-Device
Advance	I-Device
.	O
</s>
<s>
It	O
is	O
the	O
counterpart	O
of	O
Superman	B-Application
Returns	I-Application
.	O
</s>
<s>
It	O
features	O
various	O
puzzle	O
challenge	O
(	O
one	O
of	O
which	O
was	O
Sudoku	O
with	O
superpowers	O
)	O
punctuated	O
with	O
short	O
flying	O
action	B-Application
sequences	O
.	O
</s>
