<s>
Maelstrom	B-Application
is	O
a	O
video	O
game	O
developed	O
by	O
Andrew	O
Welch	O
,	O
released	O
as	O
shareware	B-License
in	O
November	O
1992	O
for	O
Mac	B-Application
OS	I-Application
.	O
</s>
<s>
The	O
game	O
is	O
an	O
enhanced	O
clone	B-General_Concept
of	O
Atari	O
,	O
Inc.	O
'	O
s	O
1979	O
arcade	O
game	O
with	O
a	O
visual	O
style	O
similar	O
to	O
the	O
Atari	O
Games	O
1987	O
sequel	O
,	O
.	O
</s>
<s>
The	O
game	O
was	O
later	O
released	O
as	O
free	B-License
and	I-License
open-source	I-License
software	I-License
,	O
resulting	O
in	O
ports	O
for	O
other	O
platforms	O
.	O
</s>
<s>
The	O
object	O
of	O
the	O
game	O
is	O
to	O
reach	O
the	O
highest	O
score	O
possible	O
by	O
shooting	O
asteroids	B-Application
with	O
a	O
plasma	O
cannon	O
from	O
a	O
spaceship	O
.	O
</s>
<s>
was	O
created	O
using	O
THINK	B-Operating_System
C	I-Operating_System
and	O
uses	O
18,000	O
lines	O
of	O
C	B-Language
code	O
with	O
9,000	O
lines	O
of	O
inline	O
assembly	B-Language
language	I-Language
.	O
</s>
<s>
In	O
1993	O
,	O
Maelstrom	B-Application
won	O
"	O
Best	O
New	O
Macintosh	O
Product	O
"	O
in	O
the	O
"	O
Shareware	B-Application
Industry	I-Application
Awards	I-Application
for	O
Best	O
Game	O
,	O
"	O
as	O
well	O
as	O
receiving	O
other	O
awards	O
.	O
</s>
<s>
Welch	O
gave	O
the	O
source	O
code	O
to	O
Sam	O
Lantinga	O
,	O
who	O
created	O
a	O
SDL	B-Operating_System
port	O
and	O
released	O
it	O
in	O
1995	O
.	O
</s>
<s>
In	O
1999	O
Ambrosia	O
Software	O
released	O
Latinga	O
's	O
version	O
3.0	O
as	O
open-source	B-Application
software	I-Application
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
.	O
</s>
<s>
In	O
2010	O
,	O
Andrew	O
Welch	O
and	O
Ian	O
Gilman	O
released	O
the	O
game	O
's	O
contents	O
under	O
the	O
free	O
Creative	O
Commons	O
license	O
Attribution	O
,	O
which	O
makes	O
completely	O
free	B-License
and	I-License
open-source	I-License
software	I-License
.	O
</s>
