<s>
The	B-Application
Witcher	I-Application
Battle	I-Application
Arena	I-Application
was	O
a	O
free-to-play	O
multiplayer	O
online	O
battle	O
arena	O
(	O
MOBA	O
)	O
video	O
game	O
developed	O
and	O
published	O
by	O
CD	O
Projekt	O
Red	O
.	O
</s>
<s>
The	O
game	O
released	O
for	O
Android	B-Application
,	O
iOS	B-Application
,	O
and	O
Windows	B-Protocol
Phone	I-Protocol
devices	O
in	O
2015	O
,	O
and	O
was	O
playable	O
until	O
the	O
end	O
of	O
that	O
year	O
when	O
the	O
servers	O
were	O
closed	O
.	O
</s>
<s>
The	B-Application
Witcher	I-Application
Battle	I-Application
Arena	I-Application
was	O
a	O
multiplayer	O
online	O
battle	O
arena	O
set	O
within	O
the	O
universe	O
of	O
The	B-Application
Witcher	I-Application
.	O
</s>
<s>
The	B-Application
Witcher	I-Application
Battle	I-Application
Arena	I-Application
was	O
developed	O
by	O
Polish	O
video	O
game	O
studios	O
CD	O
Projekt	O
Red	O
and	O
Fuero	O
Games	O
using	O
the	O
Unity	B-Application
game	I-Application
engine	I-Application
.	O
</s>
<s>
The	O
decision	O
to	O
create	O
a	O
MOBA	O
spin-off	O
was	O
seen	O
as	O
an	O
opportunity	O
to	O
expand	O
The	B-Application
Witcher	I-Application
universe	O
onto	O
more	O
devices	O
.	O
</s>
<s>
It	O
was	O
initially	O
scheduled	O
to	O
be	O
released	O
in	O
late	O
2014	O
on	O
Android	B-Application
,	O
iOS	B-Application
,	O
and	O
Windows	B-Protocol
Phone	I-Protocol
tablet	O
and	O
mobile	O
devices	O
.	O
</s>
<s>
Android	B-Application
and	O
iOS	B-Application
versions	O
launched	O
on	O
22	O
January	O
2015	O
,	O
and	O
later	O
that	O
year	O
on	O
Windows	B-Protocol
Phone	I-Protocol
.	O
</s>
<s>
The	B-Application
Witcher	I-Application
Battle	I-Application
Arena	I-Application
received	O
"	O
mixed	O
or	O
average	O
"	O
reviews	O
from	O
professional	O
critics	O
according	O
to	O
review	B-Application
aggregator	I-Application
website	O
Metacritic	O
.	O
</s>
