<s>
Sol	B-Application
Survivor	I-Application
is	O
an	O
independent	O
tower	B-Application
defense	I-Application
video	O
game	O
developed	O
by	O
American	O
studio	O
Cadenza	O
Interactive	O
.	O
</s>
<s>
It	O
was	O
released	O
in	O
September	O
2009	O
on	O
Xbox	B-Operating_System
360	I-Operating_System
via	O
Xbox	B-Application
LIVE	I-Application
Indie	O
Games	O
and	O
on	O
March	O
15	O
,	O
2010	O
on	O
Windows	O
via	O
Steam	B-Application
and	O
Impulse	B-Application
.	O
</s>
<s>
Sol	B-Application
Survivor	I-Application
is	O
distinguished	O
in	O
part	O
by	O
an	O
interactive	O
"	O
support	O
"	O
mechanic	O
,	O
allowing	O
players	O
to	O
assist	O
their	O
stationary	O
defenses	O
with	O
additional	O
damage	O
or	O
effects	O
deployed	O
from	O
orbit	O
.	O
</s>
<s>
Another	O
distinctive	O
feature	O
of	O
Sol	B-Application
Survivor	I-Application
is	O
that	O
it	O
offers	O
multiple	O
game	O
modes	O
,	O
several	O
of	O
which	O
allow	O
players	O
to	O
team	O
up	O
against	O
the	O
aliens	O
.	O
</s>
<s>
Creeps	O
in	O
Sol	B-Application
Survivor	I-Application
take	O
preset	O
paths	O
from	O
a	O
spawn	O
node	O
to	O
a	O
colony	O
.	O
</s>
