<s>
The	O
most	O
obvious	O
game	O
to	O
compare	O
it	O
to	O
is	O
Dig	B-Application
Dug	I-Application
,	O
but	O
without	O
the	O
boulders	O
and	O
with	O
various	O
devices	O
like	O
teleporting	O
doors	O
,	O
speed	O
,	O
dynamite	O
,	O
and	O
a	O
wet	O
suit	O
.	O
</s>
<s>
Lava	O
can	O
spew	O
out	O
at	O
a	O
vertical	O
direction	O
towards	O
the	O
player	O
and	O
kill	O
him	O
;	O
it	O
does	O
not	O
reset	O
itself	O
even	O
after	O
the	O
players	O
loses	O
a	O
life	O
(	O
but	O
it	O
does	O
reset	O
itself	O
after	O
a	O
game	B-Application
over	I-Application
)	O
Passwords	O
are	O
activated	O
by	O
pressing	O
a	O
certain	O
button	O
combination	O
on	O
the	O
password	O
screen	O
.	O
</s>
