<s>
Mega	B-Application
Man	I-Application
Battle	I-Application
Network	I-Application
4	I-Application
is	O
a	O
video	O
game	O
developed	O
by	O
Capcom	O
for	O
the	O
Game	B-Device
Boy	I-Device
Advance	I-Device
(	O
GBA	B-Device
)	O
handheld	B-Application
game	I-Application
console	I-Application
.	O
</s>
<s>
It	O
is	O
the	O
fourth	O
game	O
in	O
the	O
Mega	B-Application
Man	I-Application
Battle	I-Application
Network	I-Application
series	O
.	O
</s>
<s>
The	O
European	O
version	O
featured	O
a	O
completely	O
different	O
logo	O
,	O
which	O
was	O
also	O
used	O
on	O
Mega	B-Application
Man	I-Application
X7	I-Application
,	O
Mega	B-Application
Man	I-Application
X8	I-Application
,	O
Mega	B-Application
Man	I-Application
Zero	I-Application
2	I-Application
,	O
Mega	B-Application
Man	I-Application
Zero	I-Application
3	I-Application
,	O
Mega	B-Application
Man	I-Application
Zero	I-Application
4	I-Application
,	O
Mega	B-Application
Man	I-Application
X	I-Application
:	I-Application
Command	I-Application
Mission	I-Application
,	O
Mega	B-Application
Man	I-Application
Network	I-Application
Transmission	I-Application
,	O
Mega	B-Application
Man	I-Application
Battle	I-Application
Chip	I-Application
Challenge	I-Application
,	O
Mega	B-Application
Man	I-Application
Battle	I-Application
Network	I-Application
3	I-Application
,	O
and	O
Mega	B-Application
Man	I-Application
Battle	I-Application
Network	I-Application
5	I-Application
.	O
</s>
<s>
Like	O
Battle	B-Application
Network	I-Application
3	I-Application
before	O
it	O
,	O
Battle	B-Application
Network	I-Application
4	I-Application
has	O
two	O
different	O
versions	O
,	O
Red	O
Sun	O
and	O
Blue	O
Moon	O
,	O
that	O
differ	O
in	O
story	O
and	O
gameplay	O
details	O
.	O
</s>
<s>
Battle	B-Application
Network	I-Application
4	I-Application
is	O
compatible	O
with	O
the	O
e-Reader	B-Application
,	O
and	O
can	O
be	O
linked	O
up	O
with	O
Rockman	B-Device
EXE	I-Device
4.5	I-Device
Real	I-Device
Operation	I-Device
and	O
the	O
Battle	O
Chip	O
Gate	O
for	O
NetBattles	O
.	O
</s>
<s>
It	O
is	O
able	O
to	O
link	O
with	O
Mega	B-Application
Man	I-Application
Zero	I-Application
3	I-Application
,	O
and	O
contains	O
references	O
to	O
Konami	O
's	O
Boktai	B-Application
series	O
.	O
</s>
<s>
The	O
game	O
then	O
cuts	O
to	O
the	O
protagonists	O
,	O
Lan	O
Hikari	O
and	O
MegaMan.EXE	O
(	O
in	O
this	O
continuity	O
a	O
Network	O
Navigator	O
or	O
NetNavi	O
,	O
an	O
in-universe	O
AI	B-Application
program	I-Application
)	O
,	O
going	O
shopping	O
with	O
their	O
father	O
.	O
</s>
<s>
The	O
asteroid	O
leaves	O
,	O
and	O
Regal	O
appeared	O
to	O
have	O
committed	O
suicide	O
in	O
order	O
to	O
avoid	O
legal	O
prosecution	O
,	O
but	O
was	O
revealed	O
to	O
be	O
alive	O
in	O
the	B-Application
sequel	I-Application
.	O
</s>
<s>
Battle	B-Application
Network	I-Application
4	I-Application
greatly	O
differs	O
from	O
Battle	B-Application
Network	I-Application
3	I-Application
in	O
many	O
ways	O
,	O
the	O
most	O
notable	O
of	O
which	O
is	O
the	O
concept	O
of	O
DoubleSoul	O
(	O
Soul	O
Unison	O
in	O
the	O
original	O
)	O
.	O
</s>
<s>
"	O
Battle	B-Application
Network	I-Application
4	I-Application
"	O
brings	O
out	O
many	O
new	O
chips	O
,	O
with	O
standard	O
chips	O
weighing	O
in	O
with	O
150	O
unique	O
attacks	O
.	O
</s>
<s>
Instead	O
of	O
V1	O
,	O
V2	O
,	O
V3	O
,	O
V4	O
,	O
and	O
V5	O
chips	O
(	O
previously	O
found	O
in	O
Battle	O
Network	O
1	O
and	O
2	O
with	O
V4	O
and	O
V5	O
chips	O
found	O
only	O
in	O
3	O
)	O
are	O
now	O
(	O
Navi	O
)	O
,	O
(	O
Navi	O
)	O
SP	O
,	O
(	O
Navi	O
)	O
DS	B-Device
.	O
</s>
<s>
For	O
example	O
,	O
the	O
player	O
may	O
obtain	O
the	O
"	O
Z-Saber	O
"	O
chip	O
by	O
linking	O
their	O
game	O
with	O
a	O
copy	O
of	O
Mega	B-Application
Man	I-Application
Zero	I-Application
3	I-Application
.	O
</s>
<s>
Battle	B-Application
Network	I-Application
4	I-Application
replaces	O
these	O
with	O
badges	O
(	O
sometimes	O
called	O
icons	O
or	O
marks	O
instead	O
)	O
on	O
the	O
top	O
of	O
the	O
title	O
screen	O
,	O
and	O
continues	O
these	O
for	O
the	O
remainder	O
of	O
the	O
series	O
.	O
</s>
<s>
Battle	B-Application
Network	I-Application
4	I-Application
includes	O
seven	O
icons	O
,	O
one	O
for	O
defeating	O
the	O
final	O
boss	O
Duo	O
,	O
one	O
for	O
getting	O
all	O
Soul	O
Unisons	O
,	O
one	O
for	O
collecting	O
all	O
Standard-level	O
battlechips	O
,	O
one	O
for	O
all	O
Mega-level	O
chips	O
,	O
one	O
for	O
all	O
Giga-level	O
chips	O
,	O
one	O
for	O
completing	O
all	O
Program	O
Advances	O
,	O
and	O
the	O
last	O
for	O
defeating	O
Bass	O
(	O
Forte	O
in	O
Japanese	O
)	O
in	O
his	O
Omega	O
form	O
.	O
</s>
<s>
Linking	O
any	O
edition	O
of	O
Mega	B-Application
Man	I-Application
Battle	I-Application
Network	I-Application
4	I-Application
with	O
the	O
Battle	O
Chip	O
Gate	O
expansion	O
for	O
Game	B-Device
Boy	I-Device
Advance	I-Device
(	O
Sold	O
in	O
Japan	O
only	O
)	O
would	O
allow	O
you	O
to	O
play	O
as	O
a	O
Navi	O
,	O
depending	O
on	O
what	O
Navi	O
chip	O
you	O
owned	O
.	O
</s>
<s>
This	O
game	O
is	O
known	O
to	O
become	O
unplayable	O
on	O
original	O
Nintendo	B-Device
DS	I-Device
systems	O
.	O
</s>
<s>
It	O
does	O
not	O
occur	O
on	O
any	O
other	O
Nintendo	B-Device
DS	I-Device
family	O
system	O
or	O
on	O
any	O
Game	B-Device
Boy	I-Device
Advance	I-Device
family	O
systems	O
.	O
</s>
<s>
Capcom	O
of	O
Japan	O
gathered	O
together	O
their	O
surplus	O
of	O
Rock	O
Man	O
EXE	O
4	O
:	O
Tournament	O
Red	O
Sun	O
and	O
Rock	O
Man	O
EXE	O
4	O
:	O
Tournament	O
Blue	O
Moon	O
games	O
and	O
put	O
them	O
in	O
a	O
special	O
edition	O
box	O
that	O
was	O
released	O
in	O
Japan	O
only	O
on	O
December	O
31	O
,	O
2004	O
along	O
with	O
a	O
special	O
E-Card	O
for	O
the	O
E-Reader	B-Application
.	O
</s>
<s>
The	O
two	O
versions	O
of	O
Mega	B-Application
Man	I-Application
Battle	I-Application
Network	I-Application
4	I-Application
entered	O
Japanese	O
sales	O
charts	O
as	O
the	O
second	O
and	O
fourth	O
best-selling	O
games	O
of	O
their	O
release	O
week	O
and	O
continued	O
to	O
appear	O
on	O
the	O
top	O
10	O
best-sellers	O
list	O
for	O
the	O
following	O
six	O
weeks	O
.	O
</s>
<s>
Mega	B-Application
Man	I-Application
Battle	I-Application
Network	I-Application
4	I-Application
has	O
sold	O
1.35	O
million	O
copies	O
worldwide	O
as	O
of	O
December	O
31	O
,	O
2008	O
,	O
becoming	O
the	O
best-selling	O
game	O
in	O
the	O
Battle	O
Network	O
series	O
.	O
</s>
