<s>
Söldner-X	B-Application
:	I-Application
Himmelsstürmer	I-Application
is	O
a	O
2007	O
scrolling	O
shooter	O
video	O
game	O
developed	O
by	O
German	O
company	O
SideQuest	B-Application
Studios	I-Application
and	O
published	O
by	O
Eastasiasoft	B-Application
.	O
</s>
<s>
The	O
game	O
was	O
initially	O
released	O
physically	O
for	O
Microsoft	B-Application
Windows	I-Application
on	O
December	O
14	O
,	O
2007	O
,	O
before	O
coming	O
to	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
via	O
the	O
PlayStation	B-Device
Network	I-Device
in	O
December	O
2008	O
.	O
</s>
<s>
Söldner-X	B-Application
is	O
a	O
traditional	O
2D	O
shoot	O
'	O
em	O
up	O
game	O
with	O
parallax	O
scrolling	O
,	O
720p	O
high-definition	O
graphics	O
,	O
weather	O
effects	O
and	O
a	O
rich	O
weapon	O
upgrade	O
system	O
.	O
</s>
<s>
The	O
title	O
of	O
the	O
game	O
is	O
Söldner-X	B-Application
:	I-Application
Himmelsstürmer	I-Application
,	O
a	O
German	O
expression	O
.	O
</s>
<s>
Söldner-X	B-Application
translates	O
as	O
Mercenary-X	O
.	O
</s>
<s>
A	O
sequel	O
titled	O
Söldner-X	B-Application
2	O
:	O
Final	O
Prototype	O
released	O
exclusively	O
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
(	O
as	O
a	O
downloadable	O
game	O
)	O
,	O
appeared	O
in	O
May	O
2010	O
.	O
</s>
<s>
It	O
was	O
also	O
released	O
in	O
March	O
2015	O
for	O
the	O
PlayStation	B-Device
Vita	I-Device
.	O
</s>
<s>
An	O
enhanced	O
version	O
of	O
the	O
game	O
for	O
the	B-Operating_System
PlayStation	I-Operating_System
4	I-Operating_System
,	O
titled	O
Söldner-X	B-Application
2	O
:	O
Final	O
Prototype	O
Definitive	O
Edition	O
was	O
released	O
in	O
November	O
2020	O
.	O
</s>
