<s>
Alley	B-Application
Cat	I-Application
is	O
a	O
video	O
game	O
created	O
by	O
Bill	O
Williams	O
and	O
published	O
by	O
Synapse	O
Software	O
for	O
the	O
Atari	B-Device
8-bit	I-Device
family	I-Device
in	O
1983	O
.	O
</s>
<s>
A	O
port	O
for	O
the	O
IBM	B-Device
PC	I-Device
as	O
a	O
self-booting	O
disk	O
and	O
the	O
IBM	B-Device
PCjr	I-Device
were	O
published	O
in	O
1984	O
by	O
IBM	O
.	O
</s>
<s>
These	O
use	O
four-color	O
CGA	B-Device
graphics	I-Device
.	O
</s>
<s>
Alley	B-Application
Cat	I-Application
was	O
based	O
on	O
a	O
one-screen	O
prototype	O
by	O
John	O
Harris	O
.	O
</s>
<s>
In	O
another	O
challenge	O
,	O
the	O
cat	O
must	O
collect	O
three	O
ferns	O
from	O
the	O
top	O
of	O
a	O
bookshelf	O
while	O
avoiding	O
a	O
disproportionately	O
large	O
spider	B-Protocol
that	O
may	O
lower	O
itself	O
upon	O
the	O
cat	O
from	O
above	O
.	O
</s>
<s>
In	O
particular	O
,	O
the	O
broom	O
might	O
often	O
throw	O
the	O
cat	O
right	O
at	O
the	O
above-mentioned	O
dog	O
or	O
spider	B-Protocol
,	O
or	O
throw	O
it	O
right	O
back	O
out	O
of	O
the	O
window	O
.	O
</s>
<s>
An	O
unofficial	O
fan	O
remake	O
entitled	O
Alley	B-Application
Cat	I-Application
Remeow	O
Edition	O
was	O
freely	O
released	O
in	O
2018	O
.	O
</s>
