<s>
Ys	B-Application
vs.	I-Application
Trails	I-Application
in	I-Application
the	I-Application
Sky	I-Application
:	I-Application
Alternative	I-Application
Saga	I-Application
is	O
a	O
2010	O
crossover	O
fighting	O
game	O
developed	O
and	O
published	O
by	O
Nihon	O
Falcom	O
.	O
</s>
<s>
Similar	O
to	O
the	O
concept	O
of	O
Super	B-Application
Smash	I-Application
Bros	I-Application
.	I-Application
and	O
Dissidia	B-Application
Final	I-Application
Fantasy	I-Application
,	O
the	O
game	O
involves	O
players	O
choosing	O
a	O
character	O
and	O
participating	O
in	O
up	O
to	O
four-player	O
fights	O
against	O
other	O
characters	O
sourced	O
from	O
Falcom	O
's	O
Ys	O
and	O
Trails	O
role-playing	O
game	O
series	O
.	O
</s>
<s>
It	O
released	O
only	O
in	O
Japan	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
on	O
July	O
29	O
.	O
</s>
<s>
Ys	B-Application
vs.	I-Application
Trails	I-Application
in	I-Application
the	I-Application
Sky	I-Application
plays	O
as	O
a	O
crossover	O
fighting	O
game	O
,	O
similar	O
in	O
concept	O
the	O
Super	O
Smash	O
Bros.	O
,	O
Dissidia	B-Application
Final	I-Application
Fantasy	I-Application
,	O
and	O
Tales	B-Application
of	I-Application
VS	I-Application
,	O
in	O
which	O
the	O
player	O
chooses	O
characters	O
taken	O
from	O
a	O
series	O
and	O
directs	O
them	O
in	O
a	O
fight	O
against	O
characters	O
from	O
other	O
franchises	O
.	O
</s>
<s>
Some	O
of	O
these	O
characters	O
come	O
from	O
other	O
Falcom	O
games	O
,	O
such	O
as	O
Jurio	O
and	O
Chris	O
from	O
The	B-Application
Legend	I-Application
of	I-Application
Heroes	I-Application
II	I-Application
:	I-Application
Prophecy	I-Application
of	I-Application
the	I-Application
Moonlight	I-Application
Witch	I-Application
,	O
Dela	O
from	O
Brandish	B-Application
,	O
and	O
Gurumins	B-Application
from	O
Gurumin	B-Application
.	O
</s>
<s>
Ys	B-Application
vs.	I-Application
Trails	I-Application
in	I-Application
the	I-Application
Sky	I-Application
was	O
first	O
announced	O
in	O
an	O
issue	O
of	O
Dengeki	O
PlayStation	O
in	O
November	O
2009	O
.	O
</s>
<s>
The	O
game	O
was	O
created	O
due	O
to	O
Nihon	O
Falcom	O
's	O
desire	O
to	O
make	O
use	O
of	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
's	O
wireless	O
ad	O
hoc	O
local	O
multiplayer	O
function	O
,	O
something	O
they	O
had	O
not	O
been	O
able	O
to	O
work	O
into	O
prior	O
JRPG	O
titles	O
.	O
</s>
<s>
Ys	B-Application
vs.	I-Application
Trails	I-Application
in	I-Application
the	I-Application
Sky	I-Application
was	O
released	O
in	O
Japan	O
on	O
July	O
29	O
,	O
2010	O
.	O
</s>
<s>
The	O
game	O
was	O
one	O
of	O
many	O
in	O
the	O
release	O
week	O
that	O
IGN	O
cited	O
as	O
being	O
drivers	O
in	O
PSP	B-Operating_System
hardware	O
as	O
well	O
,	O
with	O
the	O
system	O
itself	O
doubling	O
the	O
sales	O
of	O
its	O
prior	O
week	O
.	O
</s>
<s>
The	O
game	O
sold	O
well	O
enough	O
to	O
warrant	O
a	O
"	O
The	B-Device
Best	I-Device
"	O
budget	O
re-release	O
in	O
July	O
2011	O
.	O
</s>
