<s>
Knights	B-Application
of	I-Application
Valour	I-Application
(	O
)	O
is	O
a	O
side-scrolling	B-Application
beat	I-Application
'	I-Application
em	I-Application
up	I-Application
video	O
game	O
series	O
released	O
by	O
International	O
Games	O
System	O
(	O
IGS	O
)	O
.	O
</s>
<s>
The	O
plot	O
is	O
loosely	O
adapted	O
from	O
the	O
14th	O
century	O
Chinese	O
historical	O
novel	O
Romance	B-Application
of	I-Application
the	I-Application
Three	I-Application
Kingdoms	I-Application
by	O
Luo	O
Guanzhong	O
,	O
and	O
features	O
the	O
Five	O
Tiger	O
Generals	O
,	O
Zhuge	O
Liang	O
,	O
Diaochan	O
and	O
others	O
as	O
playable	O
characters	O
.	O
</s>
<s>
The	O
series	O
includes	O
eleven	O
games	O
,	O
including	O
five	O
main	O
titles	O
:	O
Knights	B-Application
of	I-Application
Valour	I-Application
(	O
1999	B-Application
)	O
,	O
Knights	B-Application
of	I-Application
Valour	I-Application
2	O
(	O
2000	B-Application
)	O
,	O
Knights	B-Application
of	I-Application
Valour	I-Application
:	O
The	O
Seven	O
Spirits	O
(	O
2003	B-Application
)	O
,	O
Knights	B-Application
of	I-Application
Valour	I-Application
3	O
(	O
2011	B-Application
)	O
,	O
and	O
the	O
remade	O
Knights	B-Application
of	I-Application
Valour	I-Application
(	O
2015	B-Application
)	O
.	O
</s>
<s>
All	O
but	O
two	O
games	O
in	O
the	O
series	O
ran	O
on	O
the	O
IGS	O
 '	O
own	O
PolyGame	B-Application
Master	I-Application
arcade	O
hardware	O
,	O
the	O
exceptions	O
being	O
KOV	O
The	O
Seven	O
Spirits	O
,	O
which	O
was	O
released	O
on	O
Sammy	O
Corporation	O
's	O
Atomiswave	B-Application
(	O
later	O
received	O
a	O
homebrew	O
port	O
for	O
the	B-Operating_System
Dreamcast	I-Operating_System
in	O
2020	O
)	O
,	O
and	O
the	O
Knights	B-Application
of	I-Application
Valour	I-Application
3D	O
iteration	O
,	O
which	O
was	O
released	O
online	O
for	O
PlayStation	B-Operating_System
4	I-Operating_System
and	O
mobile	O
.	O
</s>
<s>
On	O
17	O
September	O
2014	O
at	O
the	O
Tokyo	O
Game	O
Show	O
,	O
IGS	O
announced	O
the	O
release	O
of	O
a	O
3D	O
installment	O
of	O
Knights	B-Application
of	I-Application
Valour	I-Application
for	O
the	B-Operating_System
PlayStation	I-Operating_System
4	I-Operating_System
.	O
</s>
<s>
The	O
free-to-play	O
game	O
was	O
slated	O
for	O
release	O
in	O
Spring	O
2015	B-Application
in	O
Asia	O
and	O
Japan	O
.	O
</s>
<s>
In	O
January	O
2015	B-Application
at	O
the	O
Taipei	O
Game	O
Show	O
,	O
it	O
was	O
announced	O
the	O
game	O
had	O
been	O
delayed	O
to	O
a	O
summer	O
release	O
.	O
</s>
<s>
On	O
4	O
March	O
2015	B-Application
,	O
a	O
beta	O
version	O
was	O
released	O
for	O
trial	O
for	O
PlayStation	O
Plus	O
subscribers	O
on	O
the	O
PS4	B-Operating_System
and	O
ran	O
until	O
19	O
March	O
.	O
</s>
