<s>
FreeCell	B-Application
,	O
also	O
known	O
as	O
Microsoft	B-Application
FreeCell	I-Application
,	O
is	O
a	O
computer	O
game	O
included	O
in	O
Microsoft	B-Application
Windows	I-Application
,	O
based	O
on	O
a	O
card	O
game	O
with	O
the	B-Application
same	I-Application
name	I-Application
.	O
</s>
<s>
Paul	O
Alfille	O
implemented	O
Freecell	B-Application
in	O
1978	O
for	O
the	O
PLATO	B-Operating_System
computer	I-Operating_System
system	O
at	O
CERL	B-Operating_System
;	O
by	O
the	O
early	O
1980s	O
Control	O
Data	O
Corporation	O
had	O
published	O
it	O
for	O
all	O
PLATO	B-Operating_System
systems	I-Operating_System
.	O
</s>
<s>
Jim	O
Horne	O
,	O
who	O
enjoyed	O
playing	O
Freecell	B-Application
on	O
the	O
PLATO	B-Operating_System
system	I-Operating_System
at	O
the	O
University	O
of	O
Alberta	O
,	O
published	O
a	O
shareware	B-License
$10	O
DOS	B-Device
version	O
with	O
color	O
graphics	O
in	O
1988	O
.	O
</s>
<s>
That	O
year	O
Horne	O
joined	O
Microsoft	O
,	O
and	O
later	O
ported	O
the	O
game	O
to	O
Windows	B-Application
.	O
</s>
<s>
The	O
Windows	B-Application
version	O
was	O
first	O
included	O
in	O
Microsoft	B-Application
Entertainment	I-Application
Pack	I-Application
Volume	O
2	O
and	O
later	O
the	O
Best	B-Application
Of	I-Application
Microsoft	I-Application
Entertainment	I-Application
Pack	I-Application
.	O
</s>
<s>
It	O
was	O
subsequently	O
included	O
with	O
Win32s	B-Library
as	O
an	O
application	O
that	O
enabled	O
the	O
testing	O
of	O
the	O
32-bit	O
thunking	O
layer	O
to	O
ensure	O
that	O
it	O
was	O
installed	O
properly	O
.	O
</s>
<s>
However	O
,	O
FreeCell	B-Application
remained	O
relatively	O
obscure	O
until	O
it	O
was	O
released	O
as	O
part	O
of	O
Windows	B-Application
95	I-Application
.	O
</s>
<s>
In	O
Windows	B-Application
XP	I-Application
,	O
FreeCell	B-Application
was	O
extended	O
to	O
support	O
a	O
total	O
of	O
1	O
million	O
card	O
deals	O
.	O
</s>
<s>
Today	O
,	O
there	O
are	O
FreeCell	B-Application
implementations	O
for	O
nearly	O
every	O
modern	O
operating	O
system	O
as	O
it	O
is	O
one	O
of	O
the	O
few	O
games	O
pre-installed	O
with	O
every	O
copy	O
of	O
Windows	B-Application
.	O
</s>
<s>
Prior	O
to	O
Windows	B-Application
Vista	I-Application
,	O
the	O
versions	O
for	O
Windows	B-Application
were	O
limited	O
in	O
their	O
player	O
assistance	O
features	O
,	O
such	O
as	O
retraction	O
of	O
moves	O
.	O
</s>
<s>
The	O
Windows	B-Application
Vista	I-Application
FreeCell	B-Application
implementation	O
contains	O
basic	O
hints	O
and	O
unlimited	O
move	O
retraction	O
(	O
via	O
the	O
Undo	O
menu	O
choice	O
or	O
command	O
)	O
,	O
and	O
the	O
option	O
to	O
restart	O
the	O
game	O
.	O
</s>
<s>
FreeCell	B-Application
is	O
not	O
included	O
in	O
the	O
Windows	B-Application
8	I-Application
operating	O
system	O
but	O
is	O
available	O
in	O
the	O
Windows	B-Application
Store	I-Application
as	O
the	O
free	O
Microsoft	B-Application
Solitaire	I-Application
Collection	I-Application
,	O
which	O
is	O
also	O
bundled	O
with	O
Windows	B-Operating_System
10	I-Operating_System
.	O
</s>
<s>
Microsoft	O
created	O
the	O
Entertainment	B-Application
Packs	I-Application
to	O
encourage	O
non-business	O
use	O
of	O
Windows	B-Application
.	O
</s>
<s>
According	O
to	O
company	O
telemetry	O
FreeCell	B-Application
was	O
the	O
seventh	O
most-used	O
Windows	B-Application
program	O
,	O
ahead	O
of	O
Word	B-Application
and	O
Microsoft	B-Application
Excel	I-Application
.	O
</s>
<s>
The	O
original	O
Microsoft	B-Application
FreeCell	I-Application
package	O
supports	O
32,000	O
numbered	O
deals	O
,	O
generated	O
by	O
a	O
15-bit	O
,	O
pseudorandom-number	O
seed	B-Algorithm
.	O
</s>
<s>
Later	O
versions	O
of	O
FreeCell	B-Application
include	O
more	O
than	O
one	O
million	O
deals	O
.	O
</s>
<s>
When	O
Microsoft	B-Application
FreeCell	I-Application
became	O
very	O
popular	O
during	O
the	O
1990s	O
,	O
the	O
Internet	O
FreeCell	B-Application
Project	O
attempted	O
to	O
solve	O
all	O
the	O
deals	O
by	O
crowdsourcing	O
consecutive	O
games	O
to	O
specific	O
people	O
.	O
</s>
<s>
Out	O
of	O
the	O
current	O
Microsoft	B-Application
Windows	I-Application
games	O
,	O
eight	O
are	O
unsolvable	O
.	O
</s>
<s>
The	O
significance	O
of	O
the	O
"	O
Microsoft	O
32,000	O
"	O
to	O
many	O
FreeCell	B-Application
players	O
is	O
such	O
that	O
other	O
computer	O
implementations	O
of	O
FreeCell	B-Application
will	O
often	O
go	O
out	O
of	O
their	O
way	O
to	O
guarantee	O
compatibility	O
with	O
these	O
deals	O
,	O
rather	O
than	O
simply	O
using	O
the	O
most	O
readily	O
available	O
random	B-Algorithm
number	I-Algorithm
generator	I-Algorithm
for	O
their	O
target	O
platforms	O
.	O
</s>
