<s>
is	O
a	O
1993	O
action	B-Application
role-playing	I-Application
game	I-Application
developed	O
by	O
Tonkin	O
House	O
for	O
the	O
Super	B-Application
Famicom	I-Application
.	O
</s>
<s>
Mask	O
of	O
the	O
Sun	O
was	O
one	O
of	O
two	O
games	O
released	O
under	O
the	O
title	O
of	O
Ys	O
IV	O
,	O
the	O
other	O
being	O
Hudson	O
Soft	O
's	O
Ys	B-Application
IV	I-Application
:	I-Application
The	I-Application
Dawn	I-Application
of	I-Application
Ys	I-Application
for	O
the	O
PC	O
Engine	O
CD-ROM	O
.	O
</s>
<s>
Of	O
the	O
two	O
,	O
Mask	O
of	O
the	O
Sun	O
was	O
the	O
official	O
Ys	O
IV	O
storyline	O
before	O
the	O
release	O
of	O
Ys	B-Application
:	I-Application
Memories	I-Application
of	I-Application
Celceta	I-Application
.	O
</s>
<s>
Ys	O
IV	O
takes	O
place	O
between	O
the	O
events	O
of	O
Ys	B-Application
II	I-Application
and	O
Ys	B-Application
III	I-Application
:	I-Application
Wanderers	I-Application
from	I-Application
Ys	I-Application
.	O
</s>
<s>
The	O
original	O
Ys	O
IV	O
music	O
was	O
composed	O
by	O
Falcom	O
's	O
Sound	O
Team	O
JDK	O
,	O
and	O
it	O
was	O
arranged	O
for	O
the	O
Super	B-Application
Famicom	I-Application
by	O
the	O
Cube	O
Corporation	O
sound	O
team	O
.	O
</s>
<s>
The	O
PlayStation	B-Device
2	I-Device
remake	O
of	O
Mask	O
of	O
the	O
Sun	O
only	O
used	O
the	O
original	O
Ys	O
IV	O
music	O
,	O
with	O
none	O
of	O
the	O
tracks	O
composed	O
for	O
the	O
Super	B-Application
Famicom	I-Application
version	O
being	O
present	O
.	O
</s>
<s>
Originally	O
a	O
version	O
of	O
Mask	O
of	O
the	O
Sun	O
was	O
also	O
planned	O
by	O
Sega	O
for	O
Mega	B-Operating_System
Drive	I-Operating_System
and	O
later	O
Mega-CD	B-Device
under	O
the	O
Sega-Falcom	O
joint	O
development	O
agreement	O
,	O
but	O
this	O
version	O
was	O
ultimately	O
canceled	O
.	O
</s>
<s>
In	O
2005	O
,	O
Taito	O
developed	O
a	O
remake	O
of	O
Mask	O
of	O
the	O
Sun	O
for	O
the	O
PlayStation	B-Device
2	I-Device
,	O
titled	O
Ys	B-Application
IV	I-Application
:	I-Application
Mask	I-Application
of	I-Application
the	I-Application
Sun	I-Application
-	I-Application
A	I-Application
New	I-Application
Theory	I-Application
.	O
</s>
<s>
Japanese	O
gaming	O
magazine	O
Famitsu	O
gave	O
the	O
PS2	B-Device
version	O
of	O
the	O
game	O
a	O
25	O
out	O
of	O
40	O
score	O
.	O
</s>
