<s>
Controller-free	B-Device
motion	I-Device
control	I-Device
is	O
a	O
specific	O
type	O
of	O
video	O
game	O
which	O
requires	O
no	O
actual	O
controller	O
,	O
executing	O
game	O
play	O
solely	O
on	O
the	O
user	O
's	O
movement	O
.	O
</s>
<s>
Unlike	O
the	B-Operating_System
Nintendo	I-Operating_System
Wii	I-Operating_System
or	O
Sony	O
PlayStation	B-Device
Move	I-Device
,	O
no	O
controller	O
is	O
held	O
.	O
</s>
<s>
At	O
present	O
,	O
Microsoft	O
is	O
the	O
largest	O
company	O
to	O
have	O
brought	O
this	O
technology	O
to	O
the	O
market	O
with	O
the	O
Kinect	B-Algorithm
system	O
(	O
formerly	O
known	O
as	O
Project	B-Algorithm
Natal	I-Algorithm
)	O
.	O
</s>
