<s>
Spelunker	B-Application
is	O
a	O
1983	O
platform	O
video	O
game	O
developed	O
by	O
Timothy	O
G	O
.	O
Martin	O
of	O
MicroGraphic	B-Application
Image	I-Application
.	O
</s>
<s>
Originally	O
released	O
by	O
MicroGraphic	B-Application
Image	I-Application
for	O
the	O
Atari	B-Device
8-bit	I-Device
family	I-Device
in	O
1983	O
,	O
the	O
game	O
was	O
later	O
ported	O
to	O
the	O
Commodore	O
64	O
and	O
re-released	O
by	O
Broderbund	O
in	O
1984	O
,	O
with	O
European	O
publishing	O
rights	O
licensed	O
to	O
Ariolasoft	O
.	O
</s>
<s>
It	O
was	O
released	O
on	O
arcade	O
in	O
1985	O
,	O
on	O
the	O
Nintendo	O
Entertainment	O
System	O
on	O
December	O
6	O
,	O
1985	O
in	O
Japan	O
and	O
September	O
1987	O
in	O
North	O
America	O
,	O
and	O
on	O
the	O
MSX	B-Operating_System
in	O
1986	O
.	O
</s>
<s>
A	O
sequel	O
was	O
released	O
in	O
arcades	O
in	O
1986	O
called	O
Spelunker	B-Application
II	I-Application
:	O
23	O
no	O
Kagi	O
,	O
and	O
a	O
different	O
sequel	O
for	O
the	O
NES	B-Language
on	O
September	O
18	O
,	O
1987	O
called	O
Spelunker	B-Application
II	I-Application
:	I-Application
Yūsha	I-Application
e	I-Application
no	I-Application
Chōsen	I-Application
,	O
both	O
by	O
Irem	O
and	O
in	O
Japan	O
only	O
.	O
</s>
<s>
The	O
cave	O
's	O
hazards	O
include	O
bats	B-Application
,	O
which	O
drop	O
deadly	O
guano	O
on	O
the	O
player	O
;	O
and	O
a	O
ghost	O
haunting	O
the	O
cave	O
,	O
randomly	O
appearing	O
to	O
take	O
the	O
player	O
to	O
the	O
shadow	O
world	O
.	O
</s>
<s>
Objects	O
to	O
collect	O
include	O
sticks	O
of	O
dynamite	O
,	O
flares	B-Application
,	O
and	O
keys	O
.	O
</s>
<s>
While	O
using	O
the	O
same	O
game	O
and	O
scenery	O
elements	O
,	O
the	O
NES	B-Language
and	O
MSX	B-Operating_System
levels	O
(	O
which	O
are	O
shared	O
with	O
the	B-Operating_System
Wii	I-Operating_System
and	O
3DS	B-Operating_System
versions	O
)	O
are	O
far	O
smaller	O
than	O
the	O
Atari/C64	O
levels	O
.	O
</s>
<s>
The	O
same	O
is	O
true	O
for	O
Spelunker	B-Application
HD	I-Application
.	O
</s>
<s>
The	O
NES	B-Language
and	O
MSX	B-Operating_System
versions	O
have	O
additional	O
music	O
during	O
gameplay	O
.	O
</s>
<s>
MicroGraphicImage	B-Application
was	O
founded	O
by	O
former	O
employees	O
of	O
Games	O
by	O
Apollo	O
,	O
one	O
of	O
the	O
companies	O
that	O
had	O
overproduced	O
games	O
for	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
,	O
creating	O
a	O
glut	O
of	O
cheap	O
games	O
.	O
</s>
<s>
In	O
the	O
pre-Christmas	O
market	O
of	O
1983	O
,	O
Games	O
by	O
Apollo	O
became	O
insolvent	O
,	O
with	O
several	O
games	O
still	O
in	O
development	O
for	O
a	O
number	O
of	O
platforms	O
,	O
including	O
the	O
Atari	B-Device
400/800	I-Device
.	O
</s>
<s>
Three	O
former	O
programmers	O
from	O
this	O
company	O
;	O
Tim	O
Martin	O
,	O
Robert	O
Barber	O
,	O
and	O
Cash	O
Foley	O
,	O
subsequently	O
formed	O
MicroGraphicImage	B-Application
.	O
</s>
<s>
Martin	O
had	O
been	O
previously	O
worked	O
on	O
games	O
for	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
and	O
Foley	O
developed	O
for	O
the	O
Atari	B-Device
8-bit	I-Device
family	I-Device
.	O
</s>
<s>
When	O
Games	O
by	O
Apollo	O
went	O
into	O
insolvency	O
,	O
Martin	O
and	O
Barber	O
developed	O
a	O
game	O
entitled	O
Halloween	B-Application
,	O
based	O
on	O
the	O
movie	O
.	O
</s>
<s>
The	O
contract	O
funded	O
the	O
founding	O
of	O
MicroGraphicImage	B-Application
.	O
</s>
<s>
Martin	O
and	O
Barber	O
's	O
expertise	O
was	O
with	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
,	O
and	O
they	O
were	O
dissatisfied	O
with	O
the	O
money	O
being	O
made	O
through	O
contract	O
game	O
development	O
.	O
</s>
<s>
In	O
early	O
1983	O
,	O
MicroGraphicImage	B-Application
developed	O
games	O
under	O
contract	O
for	O
Broderbund	O
,	O
Parker	O
Brothers	O
,	O
and	O
CBS	O
Electronics	O
,	O
while	O
developing	O
Spelunker	B-Application
for	O
themselves	O
.	O
</s>
<s>
Martin	O
and	O
Barber	O
had	O
been	O
developing	O
the	O
Spelunker	B-Application
game	O
design	O
for	O
some	O
time	O
,	O
but	O
it	O
went	O
beyond	O
the	O
specifications	O
for	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
.	O
</s>
<s>
As	O
Spelunker	B-Application
was	O
Martin	O
's	O
original	O
idea	O
and	O
he	O
programmed	O
the	O
game	O
logic	O
,	O
the	O
game	O
was	O
issued	O
with	O
his	O
name	O
as	O
the	O
lead	O
game	O
developer	O
,	O
with	O
the	O
intention	O
to	O
alternate	O
this	O
role	O
for	O
subsequent	O
games	O
.	O
</s>
<s>
Although	O
MicroGraphicImage	B-Application
was	O
able	O
to	O
maintain	O
a	O
steady	O
stream	O
of	O
contract	O
work	O
,	O
the	O
company	O
was	O
not	O
profitable	O
due	O
to	O
the	O
overheads	O
of	O
financial	O
business	O
focus	O
going	O
into	O
publishing	O
.	O
</s>
<s>
Eventually	O
,	O
MicroGraphicImage	B-Application
ran	O
out	O
of	O
money	O
and	O
ceased	O
operations	O
.	O
</s>
<s>
Martin	O
continued	O
working	O
with	O
Broderbund	O
on	O
a	O
business	O
level	O
and	O
was	O
able	O
recover	O
all	O
debt	O
through	O
NES	B-Language
and	O
coin-op	O
versions	O
of	O
Spelunker	B-Application
.	O
</s>
<s>
Martin	O
and	O
Foley	O
continued	O
to	O
work	O
together	O
,	O
including	O
at	O
an	O
Amiga	B-Device
publishing	O
company	O
called	O
Inovatronics	O
.	O
</s>
<s>
Bryan	O
Welch	O
reviewed	O
the	O
original	O
Atari-8	O
bit	O
version	O
of	O
Spelunker	B-Application
for	O
1984	O
Antic	O
Magazine	O
Buyers	O
Guide	O
and	O
concluded	O
:	O
"	O
I	O
wholeheartedly	O
recommend	O
Spelunker	B-Application
to	O
anyone	O
who	O
likes	O
arcade-type	O
games	O
and	O
is	O
looking	O
for	O
a	O
challenge	O
.	O
</s>
<s>
Computer	O
Gaming	O
World	O
of	O
1985	O
called	O
Spelunker	B-Application
"	O
a	O
thoroughly	O
enjoyable	O
game	O
...	O
a	O
class	O
act	O
"	O
.	O
</s>
<s>
In	O
Japan	O
,	O
Game	O
Machine	O
listed	O
the	O
arcade	O
version	O
of	O
Spelunker	B-Application
on	O
their	O
February	O
15	O
,	O
1986	O
issue	O
as	O
being	O
the	O
fourth	O
most-successful	O
table	O
arcade	O
unit	O
of	O
the	O
month	O
.	O
</s>
<s>
The	O
game	O
was	O
re-released	O
for	O
Virtual	B-Application
Console	I-Application
in	O
North	O
America	O
on	O
March	O
17	O
,	O
2008	O
,	O
and	O
in	O
Europe	O
on	O
September	O
5	O
,	O
2008	O
,	O
for	O
the	B-Operating_System
Wii	I-Operating_System
,	O
in	O
both	O
regions	O
on	O
June	O
6	O
,	O
2013	O
,	O
for	O
the	B-Operating_System
Wii	I-Operating_System
U	O
and	O
in	O
North	O
America	O
on	O
June	O
27	O
,	O
2013	O
,	O
for	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
.	O
</s>
<s>
Sony	O
Computer	O
Entertainment	O
of	O
Japan	O
released	O
Spelunker	B-Application
HD	I-Application
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
on	O
the	O
PlayStation	B-Device
Network	I-Device
Store	O
.	O
</s>
<s>
The	O
game	O
is	O
a	O
remake	O
of	O
the	O
NES	B-Language
port	O
,	O
with	O
high	O
definition	O
graphics	O
and	O
10	O
large	O
caves	O
with	O
10	O
levels	O
in	O
each	O
.	O
</s>
<s>
In	O
2015	O
,	O
Square	O
Enix	O
released	O
the	O
free-to-play	O
sequel	O
Spelunker	B-Application
World	I-Application
for	O
PlayStation	B-Operating_System
4	I-Operating_System
and	O
PlayStation	B-Device
Vita	I-Device
.	O
</s>
<s>
On	O
April	O
20	O
,	O
2017	O
,	O
a	O
new	O
game	O
based	O
on	O
Spelunker	B-Application
World	I-Application
was	O
released	O
in	O
Japan	O
for	O
the	O
Nintendo	B-Application
Switch	I-Application
.	O
</s>
<s>
It	O
was	O
later	O
released	O
as	O
a	O
download	O
worldwide	O
and	O
physically	O
only	O
in	O
Japan	O
,	O
as	O
Spelunker	B-Application
Party	O
!	O
</s>
<s>
In	O
2016	O
,	O
a	O
collaboration	O
between	O
Spelunker	B-Application
and	O
the	O
Neptunia	B-Application
series	O
resulted	O
to	O
an	O
unlockable	O
minigame	O
mode	O
called	O
"	O
Neplunker	O
"	O
for	O
Megadimension	B-Application
Neptunia	I-Application
VII	I-Application
.	O
</s>
<s>
An	O
updated	O
version	O
of	O
the	O
game	O
was	O
announced	O
in	O
2018	O
for	O
the	O
Intellivision	B-Application
Amico	I-Application
.	O
</s>
