<s>
Shift	O
is	O
a	O
Flash	B-Protocol
game	I-Protocol
series	O
created	O
and	O
developed	O
by	O
Antony	O
Lavelle	O
and	O
published	O
by	O
Armor	O
Games	O
.	O
</s>
<s>
The	O
game	O
has	O
been	O
ported	O
to	O
several	O
platforms	O
,	O
including	O
iOS	B-Operating_System
and	O
PlayStation	B-Device
Minis	I-Device
.	O
</s>
<s>
The	O
gameplay	O
revolves	O
around	O
pressing	O
the	O
shift	B-Device
key	I-Device
to	O
flip	O
the	O
room	O
.	O
</s>
<s>
It	O
was	O
released	O
for	O
iOS	B-Operating_System
on	O
May	O
1	O
,	O
2009	O
.	O
</s>
<s>
It	O
was	O
released	O
for	O
iOS	B-Operating_System
on	O
Dec	O
22	O
,	O
2010	O
.	O
</s>
<s>
Shift	O
Lite	O
is	O
a	O
version	O
of	O
the	O
game	O
released	O
for	O
iOS	B-Operating_System
on	O
May	O
2	O
,	O
2009	O
.	O
</s>
<s>
Shift	O
Extended	O
is	O
a	O
version	O
made	O
by	O
Fishing	B-Application
Cactus	I-Application
for	O
PlayStation	B-Device
Minis	I-Device
on	O
Jan	O
18	O
,	O
2011	O
.	O
</s>
<s>
Shifting	O
World	O
is	O
a	O
game	O
based	O
on	O
the	O
Shift	O
series	O
that	O
was	O
developed	O
by	O
Fishing	B-Application
Cactus	I-Application
and	O
was	O
published	O
by	O
Arc	O
System	O
Works	O
in	O
Japan	O
(	O
where	O
it	O
is	O
known	O
as	O
)	O
,	O
Aksys	O
Games	O
in	O
North	O
America	O
and	O
Rising	O
Star	O
Games	O
in	O
Europe	O
for	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
.	O
</s>
<s>
The	O
iOS	B-Operating_System
version	O
of	O
Shift	O
was	O
rated	O
3/4	O
by	O
Slide	O
to	O
Play	O
,	O
stating	O
"	O
While	O
the	O
iPhone	O
edition	O
of	O
the	O
game	O
has	O
some	O
issues	O
,	O
the	O
mind-bending	O
idea	O
at	O
the	O
core	O
of	O
the	O
experience	O
still	O
captivates.	O
"	O
</s>
<s>
The	O
iOS	B-Operating_System
version	O
of	O
Shift	O
2	O
has	O
a	O
score	O
of	O
87/100	O
on	O
Metacritic	O
.	O
</s>
