<s>
Nail	B-Application
'	I-Application
n	I-Application
 '	I-Application
Scale	I-Application
,	O
known	O
as	O
in	O
Japan	O
,	O
is	O
a	O
puzzle	O
video	O
game	O
developed	O
by	O
Data	O
East	O
for	O
the	O
Game	B-Device
Boy	I-Device
.	O
</s>
<s>
In	O
Nail	B-Application
'	I-Application
n	I-Application
 '	I-Application
Scale	I-Application
,	O
the	O
player	O
controls	O
Spike	O
,	O
a	O
skilled	O
climber	O
.	O
</s>
<s>
Players	O
can	O
continue	O
from	O
where	O
they	O
left	O
off	O
after	O
a	O
"	O
game	B-Application
over	I-Application
"	O
,	O
providing	O
that	O
they	O
never	O
turn	O
off	O
their	O
Game	B-Device
Boy	I-Device
.	O
</s>
