<s>
is	O
a	O
2007	B-Application
vertical	O
scrolling	O
shooting	O
video	O
game	O
developed	O
by	O
MOSS	O
.	O
</s>
<s>
A	O
home	O
conversion	O
was	O
produced	O
for	O
Xbox	B-Operating_System
360	I-Operating_System
in	O
2008	B-Application
.	O
</s>
<s>
An	O
updated	O
arcade	O
version	O
was	O
later	O
released	O
for	O
Taito	O
's	O
NESiCAxLive	B-Application
digital	O
distribution	O
platform	O
.	O
</s>
<s>
Two	O
more	O
versions	O
featuring	O
new	O
content	O
were	O
released	O
:	O
Raiden	B-Application
IV	I-Application
:	I-Application
OverKill	I-Application
for	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
Windows	B-Application
,	O
and	O
Raiden	B-Application
IV	I-Application
x	O
MIKADO	O
remix	O
for	O
Nintendo	B-Application
Switch	I-Application
,	O
PlayStation	B-Operating_System
4	I-Operating_System
,	O
PlayStation	B-Device
5	I-Device
,	O
Windows	B-Application
,	O
Xbox	B-Device
One	I-Device
,	O
and	O
Xbox	B-Device
Series	I-Device
X/S	I-Device
.	O
</s>
<s>
The	O
gameplay	O
of	O
Raiden	B-Application
IV	I-Application
is	O
identical	O
to	O
the	O
previous	O
games	O
.	O
</s>
<s>
The	O
Flash	O
Shot	O
mechanic	O
,	O
first	O
introduced	O
in	O
Raiden	B-Application
III	I-Application
,	O
returns	O
in	O
this	O
game	O
.	O
</s>
<s>
The	O
first	O
location	O
test	O
for	O
Raiden	B-Application
IV	I-Application
was	O
held	O
at	O
Akihabara	O
Hey	O
on	O
July	O
22	O
–	O
23	O
,	O
2006	O
,	O
on	O
an	O
Egret	O
II	O
system	O
.	O
</s>
<s>
The	O
fourth	O
and	O
final	O
location	O
test	O
was	O
held	O
at	O
Shinjuku	O
Gesen	O
Mikado	O
on	O
February	O
20	O
,	O
2007	B-Application
.	O
</s>
<s>
Moss	O
launched	O
the	O
arcade	O
version	O
of	O
Raiden	B-Application
IV	I-Application
on	O
June	O
7	O
,	O
2007	B-Application
,	O
while	O
launching	O
the	O
official	O
arcade	O
website	O
.	O
</s>
<s>
In	O
2008	B-Application
,	O
an	O
Xbox	B-Operating_System
360	I-Operating_System
port	O
came	O
,	O
which	O
includes	O
new	O
stages	O
,	O
Xbox	B-Application
Live	I-Application
support	O
,	O
monitor	O
rotation	O
options	O
,	O
and	O
downloadable	O
content	O
.	O
</s>
<s>
A	O
version	O
designed	O
for	O
the	O
NESiCAxLive	B-Application
arcade	O
download	O
system	O
was	O
unveiled	O
on	O
February	O
22	O
,	O
2011	O
,	O
in	O
AOU2011	O
.	O
</s>
<s>
New	O
features	O
include	O
perfect	O
mode	O
,	O
which	O
incorporates	O
the	O
seven-stage	O
game	O
from	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
of	O
Raiden	B-Application
IV	I-Application
,	O
and	O
background	O
music	O
from	O
the	O
Ultimate	O
of	O
Raiden	O
soundtrack	O
.	O
</s>
<s>
A	O
PlayStation	B-Operating_System
3	I-Operating_System
version	O
was	O
released	O
in	O
early	O
2014	O
as	O
Raiden	B-Application
IV	I-Application
:	I-Application
OverKill	I-Application
.	O
</s>
<s>
It	O
was	O
then	O
ported	O
to	O
Windows	B-Application
and	O
released	O
by	O
H2	O
Interactive	O
worldwide	O
on	O
September	O
3	O
,	O
2015	O
.	O
</s>
<s>
A	O
version	O
titled	O
Raiden	B-Application
IV	I-Application
x	O
MIKADO	O
remix	O
was	O
released	O
for	O
Nintendo	B-Application
Switch	I-Application
on	O
April	O
22	O
,	O
2021	O
in	O
Japan	O
,	O
on	O
May	O
6	O
,	O
2021	O
in	O
North	O
America	O
,	O
and	O
October	O
22	O
,	O
2021	O
in	O
Europe	O
.	O
</s>
<s>
It	O
was	O
later	O
ported	O
to	O
PlayStation	B-Operating_System
4	I-Operating_System
and	O
PlayStation	B-Device
5	I-Device
in	O
Japan	O
,	O
and	O
was	O
released	O
worldwide	O
by	O
NIS	O
America	O
for	O
PlayStation	B-Operating_System
4	I-Operating_System
,	O
PlayStation	B-Device
5	I-Device
,	O
Xbox	B-Device
One	I-Device
and	O
Xbox	B-Device
Series	I-Device
X/S	I-Device
in	O
early	O
2023	O
.	O
</s>
<s>
Raiden	B-Application
IV	I-Application
-Ultimate	O
of	O
Raiden	O
-	O
is	O
a	O
video	O
game	O
soundtrack	O
CD	O
by	O
INH	O
.	O
</s>
<s>
It	O
includes	O
Arcade	O
,	O
Xbox	B-Operating_System
360	I-Operating_System
,	O
and	O
remixed	O
versions	O
of	O
game	O
music	O
tracks	O
from	O
older	O
and	O
current	O
Raiden	O
games	O
,	O
with	O
a	O
total	O
of	O
27	O
tracks	O
.	O
</s>
<s>
The	O
OST	O
was	O
included	O
with	O
the	O
X360	B-Operating_System
version	O
of	O
game	O
for	O
a	O
limited	O
time	O
.	O
</s>
<s>
The	O
disc	O
named	O
Raiden	B-Application
IV	I-Application
Secret	O
File	O
,	O
contains	O
player	O
ship	O
specifications	O
,	O
enemy	O
combat	O
data	O
,	O
strategies	O
for	O
the	O
game	O
and	O
concept	O
art	O
.	O
</s>
<s>
Raiden	B-Application
IV	I-Application
has	O
received	O
mixed	O
or	O
average	O
review	O
scores	O
upon	O
its	O
U.S.	O
release	O
,	O
with	O
both	O
IGN	O
and	O
the	O
Official	O
Xbox	B-Device
Magazine	O
scoring	O
it	O
a	O
6	O
out	O
of	O
10	O
.	O
</s>
<s>
IGN	O
's	O
Eric	O
Brudvig	O
writes	O
:	O
"	O
Though	O
at	O
first	O
glance	O
you	O
might	O
think	O
there	O
are	O
14	O
levels	O
in	O
Raiden	B-Application
IV	I-Application
...	O
there	O
are	O
in	O
fact	O
only	O
seven	O
with	O
the	O
second	O
half	O
of	O
the	O
game	O
merely	O
repeating	O
the	O
first	O
....	O
UFO	O
Interactive	O
Games	O
went	O
ahead	O
and	O
added	O
insult	O
to	O
injury	O
with	O
its	O
use	O
of	O
downloadable	O
content	O
.	O
</s>
<s>
The	O
other	O
two	O
must	O
be	O
purchased	O
through	O
Xbox	B-Application
Live	I-Application
"	O
.	O
</s>
