<s>
The	O
team	O
began	O
development	O
of	O
the	O
game	O
for	O
Microsoft	B-Application
Windows	I-Application
in	O
January	O
2005	O
with	O
a	O
US$	O
20,000	O
grant	O
from	O
the	O
USC	O
Game	O
Innovation	O
Lab	O
;	O
the	O
game	O
was	O
released	O
as	O
a	O
free	O
download	O
that	O
October	O
.	O
</s>
<s>
Cloud	O
,	O
a	O
single-player	O
video	O
game	O
for	O
Microsoft	B-Application
Windows	I-Application
,	O
centers	O
on	O
a	O
boy	O
who	O
dreams	O
of	O
flying	O
through	O
the	O
sky	O
while	O
asleep	O
in	O
a	O
hospital	O
bed	O
.	O
</s>
<s>
The	O
player	O
assumes	O
control	O
of	O
the	O
sleeping	O
boy	O
's	O
avatar	B-Application
—	O
the	O
projection	O
of	O
the	O
boy	O
into	O
his	O
dream	O
world	O
—	O
and	O
guides	O
him	O
through	O
his	O
dream	O
of	O
a	O
small	O
group	O
of	O
islands	O
with	O
a	O
light	O
gathering	O
of	O
clouds	O
.	O
</s>
<s>
The	O
avatar	B-Application
's	O
direction	O
and	O
speed	O
are	O
controlled	O
with	O
a	O
mouse	O
;	O
movement	O
is	O
generally	O
on	O
a	O
horizontal	O
plane	O
,	O
but	O
vertical	O
flight	O
can	O
be	O
attained	O
by	O
holding	O
down	O
the	O
third	O
button	O
of	O
the	O
mouse	O
.	O
</s>
<s>
The	O
game	O
contains	O
three	O
types	O
of	O
clouds	O
:	O
white	O
clouds	O
,	O
which	O
follow	O
the	O
avatar	B-Application
;	O
gray	O
,	O
neutral	O
clouds	O
,	O
which	O
become	O
white	O
when	O
touched	O
;	O
and	O
black	O
clouds	O
,	O
which	O
may	O
be	O
combined	O
with	O
white	O
clouds	O
to	O
cause	O
rain	O
,	O
dissolving	O
both	O
clouds	O
.	O
</s>
<s>
White	O
clouds	O
stop	O
following	O
the	O
avatar	B-Application
if	O
the	O
player	O
moves	O
too	O
quickly	O
and	O
they	O
resume	O
following	O
if	O
approached	O
again	O
.	O
</s>
<s>
Composer	O
Vincent	O
Diamante	O
and	O
Erik	O
Nelson	O
worked	O
for	O
the	O
company	O
on	O
its	O
second	O
game	O
,	O
Flower	B-Application
.	O
</s>
