<s>
Impossible	B-Application
Mission	I-Application
is	O
a	O
video	O
game	O
originally	O
written	O
for	O
the	O
Commodore	O
64	O
by	O
Dennis	O
Caswell	O
and	O
published	O
by	O
Epyx	O
in	O
1984	O
.	O
</s>
<s>
The	O
game	O
features	O
a	O
variety	O
of	O
gameplay	O
mechanics	O
from	O
platform	O
and	O
adventure	O
games	O
,	O
and	O
includes	O
digitized	B-Application
speech	I-Application
.	O
</s>
<s>
Impossible	B-Application
Mission	I-Application
,	O
which	O
casts	O
the	O
player	O
in	O
the	O
role	O
of	O
a	O
secret	B-Application
agent	I-Application
infiltrating	O
an	O
enemy	O
stronghold	O
,	O
is	O
widely	O
considered	O
one	O
of	O
the	O
best	O
games	O
for	O
several	O
platforms	O
.	O
</s>
<s>
From	O
1985	O
to	O
1988	O
,	O
the	O
game	O
was	O
released	O
for	O
the	O
Apple	B-Device
II	I-Device
,	O
Atari	B-General_Concept
7800	I-General_Concept
,	O
ZX	B-Operating_System
Spectrum	I-Operating_System
,	O
Acorn	B-Device
Electron	I-Device
,	O
BBC	B-Device
Micro	I-Device
,	O
Amstrad	B-Device
CPC	I-Device
,	O
and	O
Master	O
System	O
.	O
</s>
<s>
The	O
player	O
takes	O
the	O
role	O
of	O
a	O
secret	B-Application
agent	I-Application
who	O
must	O
stop	O
an	O
evil	O
genius	O
,	O
Professor	O
Elvin	B-Application
Atombender	I-Application
,	O
who	O
is	O
believed	O
to	O
be	O
tampering	O
with	O
national	O
security	O
computers	O
.	O
</s>
<s>
Impossible	B-Application
Mission	I-Application
enemies	O
include	O
two	O
types	O
of	O
enemies	O
.	O
</s>
<s>
I	O
included	O
it	O
because	O
the	O
animations	O
were	O
there	O
for	O
the	O
taking	O
...	O
"	O
Caswell	O
cites	O
Rogue	B-Application
as	O
his	O
inspiration	O
for	O
the	O
randomised	O
room	O
layouts	O
,	O
and	O
the	O
electronic	O
game	O
Simon	B-Application
as	O
his	O
inspiration	O
for	O
the	O
musical	O
checkerboard	O
puzzles	O
.	O
</s>
<s>
The	O
hovering	O
balls	O
were	O
inspired	O
by	O
the	O
Rover	O
"	O
security	O
guard	O
"	O
from	O
the	B-Device
Prisoner	I-Device
TV	O
series	O
.	O
</s>
<s>
The	O
Commodore	O
64	O
version	O
features	O
early	O
use	O
of	O
digitized	B-Application
speech	I-Application
:	O
"	O
Another	O
visitor	O
.	O
</s>
<s>
The	O
digitized	B-Application
speech	I-Application
was	O
provided	O
by	O
the	O
company	O
Electronic	O
Speech	O
Systems	O
,	O
who	O
drastically	O
raised	O
their	O
prices	O
after	O
Impossible	B-Application
Mission	I-Application
became	O
a	O
successful	O
test	O
case	O
.	O
</s>
<s>
According	O
to	O
Caswell	O
,	O
"	O
The	O
choice	O
of	O
a	O
name	O
was	O
delayed	O
as	O
long	O
as	O
possible	O
,	O
and	O
Impossible	B-Application
Mission	I-Application
was	O
more	O
resorted	O
to	O
than	O
chosen	O
.	O
</s>
<s>
In	O
May	O
1985	O
,	O
Zzap	O
!	O
64	O
editors	O
ranked	O
Impossible	B-Application
Mission	I-Application
second	O
in	O
their	O
list	O
of	O
the	O
best	O
Commodore	O
64	O
games	O
,	O
while	O
readers	O
ranked	O
it	O
first	O
,	O
with	O
26%	O
of	O
votes	O
.	O
</s>
<s>
Citing	O
Impossible	B-Application
Mission	I-Application
as	O
example	O
,	O
Compute	O
!	O
</s>
<s>
The	O
ZX	B-Operating_System
Spectrum	I-Operating_System
version	O
was	O
voted	O
the	O
28th	O
best	O
game	O
of	O
all	O
time	O
in	O
a	O
special	O
issue	O
of	O
Your	O
Sinclair	O
magazine	O
in	O
2004	O
.	O
</s>
<s>
The	O
sequel	O
,	O
Impossible	B-Device
Mission	I-Device
II	I-Device
,	O
followed	O
in	O
1988	O
.	O
</s>
<s>
The	O
game	O
ElectroCop	B-Application
was	O
rumored	O
to	O
have	O
started	O
as	O
a	O
sequel	O
to	O
Impossible	B-Application
Mission	I-Application
,	O
but	O
this	O
has	O
not	O
been	O
substantiated	O
.	O
</s>
<s>
In	O
1994	O
,	O
Impossible	B-Application
Mission	I-Application
2025	I-Application
was	O
released	O
for	O
the	O
Amiga	B-Device
.	O
</s>
<s>
The	O
game	O
also	O
contains	O
the	O
Commodore	O
64	O
version	O
of	O
Impossible	B-Application
Mission	I-Application
.	O
</s>
<s>
Developers	O
System	O
3	O
revamped	O
Impossible	B-Application
Mission	I-Application
for	O
the	O
Sony	B-Operating_System
PSP	I-Operating_System
,	O
Nintendo	B-Device
DS	I-Device
and	O
Wii	B-Operating_System
.	O
</s>
<s>
In	O
the	O
US	O
,	O
the	O
Nintendo	B-Device
DS	I-Device
version	O
was	O
released	O
exclusively	O
at	O
GameStop	O
stores	O
by	O
Codemasters	O
(	O
which	O
,	O
similar	O
to	O
the	O
Amiga	B-Device
sequel	O
,	O
included	O
a	O
filter	O
for	O
graphics	O
and	O
audio	O
to	O
recreate	O
the	O
C64	O
original	O
of	O
Impossible	B-Application
Mission	I-Application
in	O
terms	O
of	O
look	O
and	O
sound	O
,	O
albeit	O
slightly	O
remastered	O
)	O
and	O
the	B-Operating_System
Wii	I-Operating_System
version	O
was	O
released	O
in	O
March	O
2008	O
.	O
</s>
<s>
This	O
revamped	O
version	O
was	O
later	O
ported	O
to	O
the	O
Nintendo	B-Application
Switch	I-Application
in	O
2019	O
.	O
</s>
