<s>
Graphic	B-Application
Adventure	I-Application
Creator	I-Application
(	O
often	O
shortened	O
to	O
GAC	O
)	O
is	O
a	O
game	O
creation	O
system/programming	O
language	O
for	O
adventure	O
games	O
published	O
by	O
Incentive	O
Software	O
,	O
originally	O
written	O
on	O
the	O
Amstrad	B-Device
CPC	I-Device
by	O
Sean	O
Ellis	O
,	O
and	O
then	O
ported	O
to	O
other	O
platforms	O
by	O
,	O
amongst	O
others	O
,	O
Brendan	O
Kelly	O
(	O
Spectrum	O
)	O
,	O
Dave	O
Kirby	O
(	O
BBC	O
,	O
Electron	O
)	O
and	O
"	O
The	O
Kid	O
"	O
(	O
Malcolm	O
Hellon	O
)	O
(	O
C64	O
)	O
.	O
</s>
<s>
GAC	O
was	O
available	O
for	O
the	O
ZX	B-Operating_System
Spectrum	I-Operating_System
,	O
Commodore	O
64	O
,	O
BBC	B-Device
Micro	I-Device
and	O
Amstrad	B-Device
CPC	I-Device
.	O
</s>
<s>
A	O
simplified	O
version	O
without	O
graphics	O
,	O
called	O
just	O
the	O
Adventure	O
Creator	O
,	O
was	O
also	O
available	O
for	O
the	O
Acorn	B-Device
Electron	I-Device
.	O
</s>
<s>
GAC	O
was	O
later	O
ported	O
to	O
the	O
Atari	B-Device
ST	I-Device
as	O
ST	O
Adventure	O
Creator	O
(	O
STAC	O
)	O
by	O
the	O
original	O
author	O
.	O
</s>
<s>
GAC	O
had	O
a	O
more	O
advanced	O
parser	B-Language
than	O
The	B-Application
Quill	I-Application
,	O
allowing	O
commands	O
like	O
GET	O
THE	O
LAMP	O
THEN	O
LIGHT	O
IT	O
,	O
and	O
a	O
built-in	O
graphics	O
editor	O
.	O
</s>
