<s>
Tunnel	B-Application
Runner	I-Application
is	O
a	O
first	O
person	O
maze	B-Application
game	I-Application
released	O
by	O
CBS	O
Electronics	O
in	O
1983	O
for	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
.	O
</s>
<s>
Tunnel	B-Application
Runner	I-Application
is	O
one	O
of	O
three	O
CBS	O
games	O
for	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
with	O
an	O
additional	O
256	O
bytes	O
of	O
RAM	O
in	O
each	O
cartridge	O
,	O
a	O
feature	O
promoted	O
by	O
CBS	O
as	O
"	O
RAM	O
Plus.	O
"	O
</s>
<s>
The	O
other	O
two	O
RAM	O
Plus	O
games	O
are	O
Mountain	B-Application
King	I-Application
and	O
the	O
port	O
of	O
Omega	B-Application
Race	I-Application
.	O
</s>
<s>
GAME2	O
mode	O
generates	O
random	O
mazes	B-Application
for	O
each	O
level	O
.	O
</s>
<s>
In	O
the	O
game	O
,	O
the	O
player	O
has	O
a	O
first	O
person	O
view	O
of	O
a	O
maze	B-Application
to	O
navigate	O
.	O
</s>
<s>
Whilst	O
many	O
mazes	B-Application
have	O
multiple	O
exit	O
doors	O
,	O
the	O
player	O
must	O
find	O
the	O
key	O
hidden	O
somewhere	O
in	O
the	O
labyrinth	O
.	O
</s>
<s>
Once	O
the	O
key	O
is	O
obtained	O
the	O
player	O
can	O
leave	O
and	O
progress	O
to	O
the	O
next	O
maze	B-Application
.	O
</s>
<s>
It	O
is	O
also	O
worth	O
mentioning	O
that	O
the	O
walls	O
 '	O
colour	O
constantly	O
changes	O
in	O
each	O
maze	B-Application
.	O
</s>
<s>
Tunnel	B-Application
Runner	I-Application
features	O
many	O
black	O
levels	O
in	O
a	O
row	O
periodically	O
,	O
making	O
them	O
a	O
real	O
challenge	O
to	O
pass	O
.	O
</s>
<s>
The	O
small	O
arrow	O
on	O
the	O
time	O
indicator	O
always	O
pinpoints	O
the	O
direction	O
the	O
player	O
is	O
facing	O
,	O
and	O
the	O
player	O
also	O
has	O
a	O
map	O
to	O
help	O
him	O
out	O
of	O
each	O
maze	B-Application
.	O
</s>
<s>
Although	O
not	O
shown	O
on	O
the	O
map	O
,	O
there	O
are	O
multiple	O
types	O
of	O
doors	O
in	O
each	O
maze	B-Application
.	O
</s>
<s>
The	O
exit	O
of	O
the	O
maze	B-Application
.	O
</s>
<s>
These	O
are	O
only	O
found	O
at	O
the	O
east	O
walls	O
of	O
each	O
maze	B-Application
,	O
and	O
are	O
shown	O
on	O
the	O
map	O
at	O
early	O
stages	O
.	O
</s>
<s>
These	O
warp	O
exits	O
only	O
appear	O
at	O
the	O
east	O
walls	O
of	O
the	O
maze	B-Application
.	O
</s>
<s>
Upon	O
entering	O
,	O
they	O
transfer	O
the	O
player	O
to	O
a	O
random	O
location	O
of	O
that	O
particular	O
maze	B-Application
.	O
</s>
