<s>
Major	B-Application
Stryker	I-Application
is	O
a	O
2D	O
vertically	O
scrolling	O
shooter	O
video	O
game	O
written	O
for	O
DOS	B-Device
by	O
Apogee	O
Software	O
.	O
</s>
<s>
It	O
consists	O
of	O
three	O
episodes	O
,	O
with	O
the	O
first	O
episode	O
distributed	O
as	O
shareware	B-License
,	O
and	O
the	O
rest	O
available	O
commercially	O
.	O
</s>
<s>
The	O
game	O
was	O
re-released	O
as	O
freeware	B-License
on	O
March	O
14	O
,	O
2006	O
,	O
and	O
on	O
Steam	B-Application
with	O
support	O
for	O
Microsoft	B-Application
Windows	I-Application
and	O
macOS	B-Application
in	O
2014	O
.	O
</s>
<s>
There	O
are	O
three	O
difficulty	O
levels	O
,	O
which	O
have	O
drastically	O
different	O
levels	O
of	O
powerups	B-Operating_System
,	O
enemies	O
,	O
and	O
enemy	O
fire	O
.	O
</s>
<s>
Powerups	B-Operating_System
can	O
be	O
obtained	O
by	O
wiping	O
out	O
an	O
entire	O
fleet	O
of	O
ships	O
or	O
destroying	O
the	O
shield	O
of	O
a	O
shielded	O
powerup	B-Operating_System
.	O
</s>
<s>
The	O
six	O
powerups	B-Operating_System
appear	O
as	O
letters	O
.	O
</s>
<s>
M	O
(	O
Major	B-Application
Stryker	I-Application
)	O
is	O
an	O
extra	O
life	O
.	O
</s>
<s>
The	O
game	O
uses	O
PC	B-Device
speaker	I-Device
and	O
Sound	B-Application
Blaster	I-Application
audio	O
.	O
</s>
<s>
The	O
EGA	B-Device
graphics	I-Device
have	O
three	O
layers	O
of	O
scrolling	O
backgrounds	O
(	O
"	O
triple-parallax	O
scrolling	O
"	O
)	O
.	O
</s>
