<s>
Released	O
for	O
the	B-Operating_System
Dreamcast	I-Operating_System
in	O
1999	O
,	O
it	O
was	O
the	O
first	O
game	O
for	O
the	O
system	O
to	O
support	O
online	B-Application
console	I-Application
gaming	I-Application
.	O
</s>
<s>
Directed	O
and	O
produced	O
by	O
Yuji	O
Naka	O
,	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
was	O
developed	O
in	O
part	O
to	O
test	O
the	O
online	O
functionality	O
of	O
the	B-Operating_System
Dreamcast	I-Operating_System
and	O
Sega	O
's	O
servers	O
,	O
and	O
test	O
the	B-Operating_System
Dreamcast	I-Operating_System
's	O
processing	O
power	O
by	O
displaying	O
many	O
characters	O
at	O
once	O
.	O
</s>
<s>
The	O
knowledge	O
gained	O
from	O
the	O
network	O
portion	O
of	O
the	O
project	O
helped	O
Sonic	O
Team	O
in	O
their	O
development	O
of	O
Phantasy	B-Application
Star	I-Application
Online	I-Application
(	O
2000	O
)	O
.	O
</s>
<s>
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
Sega	O
's	O
network	O
gaming	O
service	O
received	O
some	O
criticism	O
for	O
lag	B-Application
.	O
</s>
<s>
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
was	O
ported	O
to	O
the	O
Game	B-Device
Boy	I-Device
Advance	I-Device
as	O
a	O
launch	O
game	O
,	O
and	O
gathered	O
interest	O
as	O
the	O
first	O
game	O
published	O
by	O
Sega	O
for	O
Nintendo	O
hardware	O
.	O
</s>
<s>
It	O
was	O
ported	O
to	O
iOS	B-Application
in	O
2010	O
and	O
Android	B-Application
in	O
2011	O
,	O
but	O
these	O
versions	O
were	O
removed	O
from	O
sale	O
in	O
2015	O
.	O
</s>
<s>
The	B-Operating_System
Dreamcast	I-Operating_System
version	O
can	O
still	O
be	O
played	O
online	O
via	O
private	B-Application
servers	I-Application
.	O
</s>
<s>
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
There	O
are	O
several	O
modes	O
of	O
play	O
within	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
is	O
notable	O
for	O
being	O
the	O
first	O
Dreamcast	B-Operating_System
online	B-Application
multiplayer	I-Application
game	O
.	O
</s>
<s>
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
Director	O
and	O
producer	O
Yuji	O
Naka	O
conceived	O
the	O
game	O
as	O
a	O
way	O
to	O
use	O
the	O
power	O
of	O
the	B-Operating_System
Dreamcast	I-Operating_System
to	O
create	O
100	O
sprites	O
moving	O
at	O
once	O
.	O
</s>
<s>
Part	O
of	O
ChuChu	B-Application
Rocket	I-Application
!	O
s	O
purpose	O
was	O
to	O
test	O
the	O
capabilities	O
of	O
online	B-Application
multiplayer	I-Application
gaming	O
on	O
the	B-Operating_System
Dreamcast	I-Operating_System
;	O
the	O
team	O
used	O
what	O
they	O
learned	O
to	O
help	O
drive	O
the	O
development	O
of	O
Phantasy	B-Application
Star	I-Application
Online	I-Application
(	O
2000	O
)	O
.	O
</s>
<s>
A	O
NAOMI	B-Application
arcade	O
version	O
of	O
the	O
game	O
was	O
also	O
planned	O
,	O
but	O
later	O
scrapped	O
.	O
</s>
<s>
Sega	O
announced	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
on	O
September	O
2	O
,	O
1999	O
as	O
Sonic	O
Team	O
's	O
second	O
game	O
for	O
the	B-Operating_System
Dreamcast	I-Operating_System
after	O
Sonic	B-Application
Adventure	I-Application
(	O
1998	O
)	O
.	O
</s>
<s>
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
released	O
in	O
Japan	O
on	O
November	O
11	O
,	O
1999	O
and	O
climbed	O
to	O
the	O
top	O
of	O
the	O
Japanese	O
sales	O
charts	O
in	O
its	O
first	O
week	O
on	O
sale	O
,	O
selling	O
35,000	O
copies	O
and	O
knocking	O
the	O
PlayStation	B-Device
release	O
of	O
Chrono	B-Application
Trigger	I-Application
off	O
the	O
top	O
spot	O
.	O
</s>
<s>
That	O
December	O
,	O
video	O
game	O
magazine	O
Famitsu	O
held	O
a	O
contest	O
using	O
a	O
ChuChu-themed	O
minigame	O
for	O
the	B-Operating_System
Dreamcast	I-Operating_System
Visual	B-Application
Memory	I-Application
Unit	I-Application
(	O
VMU	B-Application
)	O
that	O
could	O
be	O
downloaded	O
from	O
the	O
internet	O
.	O
</s>
<s>
Various	O
prizes	O
were	O
given	O
out	O
to	O
winners	O
of	O
the	O
contest	O
,	O
including	O
Dreamcast	B-Operating_System
controllers	O
,	O
VMU	B-Application
stickers	O
,	O
and	O
pens	O
.	O
</s>
<s>
In	O
January	O
2000	O
,	O
Sega	O
of	O
America	O
announced	O
it	O
would	O
bring	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
Prior	O
to	O
the	O
North	O
American	O
release	O
of	O
the	O
game	O
,	O
a	O
Shockwave	B-Operating_System
demo	O
featuring	O
30	O
levels	O
from	O
the	O
game	O
's	O
puzzle	O
mode	O
was	O
made	O
available	O
to	O
play	O
on	O
personal	B-Device
computers	I-Device
through	O
Sega	O
's	O
website	O
.	O
</s>
<s>
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
It	O
retailed	O
for	O
$29.99	O
in	O
America	O
—	O
below	O
the	O
average	O
for	O
new	O
Dreamcast	B-Operating_System
games	O
.	O
</s>
<s>
Sega	O
held	O
an	O
online	O
tournament	O
on	O
March	O
25	O
,	O
2000	O
where	O
players	O
could	O
battle	O
with	O
members	O
of	O
Sonic	O
Team	O
,	O
the	B-Operating_System
Dreamcast	I-Operating_System
network	O
team	O
,	O
and	O
other	O
Sega	O
employees	O
in	O
online	O
matches	O
.	O
</s>
<s>
In	O
Europe	O
,	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
was	O
mailed	O
free	O
to	O
subscribers	O
of	O
Dreamarena	O
,	O
the	O
European	O
Dreamcast	B-Operating_System
online	O
gaming	O
service	O
.	O
</s>
<s>
A	O
port	O
of	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
was	O
released	O
as	O
a	O
launch	O
game	O
for	O
the	O
Game	B-Device
Boy	I-Device
Advance	I-Device
in	O
Japan	O
on	O
March	O
21	O
,	O
2001	O
.	O
</s>
<s>
This	O
version	O
retains	O
all	O
the	O
gameplay	O
modes	O
of	O
the	B-Operating_System
Dreamcast	I-Operating_System
version	O
except	O
online	O
play	O
.	O
</s>
<s>
Players	O
can	O
use	O
Game	B-Device
Link	I-Device
Cables	I-Device
to	O
connect	O
up	O
to	O
four	O
systems	O
together	O
to	O
play	O
using	O
only	O
one	O
cartridge	O
.	O
</s>
<s>
Sonic	O
Team	O
also	O
selected	O
2,500	O
of	O
the	O
17,000	O
custom	O
puzzles	O
uploaded	O
to	O
the	B-Operating_System
Dreamcast	I-Operating_System
servers	O
to	O
include	O
in	O
the	O
game	O
.	O
</s>
<s>
The	O
polygonal	O
graphics	O
from	O
the	B-Operating_System
Dreamcast	I-Operating_System
version	O
are	O
replaced	O
with	O
animated	O
sprites	O
.	O
</s>
<s>
This	O
version	O
of	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
was	O
re-released	O
on	O
the	O
Wii	B-Device
U	I-Device
in	O
Japan	O
on	O
October	O
21	O
,	O
2015	O
.	O
</s>
<s>
Sega	O
released	O
iOS	B-Application
and	O
Android	B-Application
ports	O
of	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
The	O
iOS	B-Application
version	O
featured	O
local	O
multiplayer	O
over	O
Wi-Fi	O
.	O
</s>
<s>
The	B-Operating_System
Dreamcast	I-Operating_System
version	O
of	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
Stuart	O
Taylor	O
of	O
Dreamcast	B-Operating_System
Magazine	O
(	O
UK	O
)	O
called	O
the	O
multiplayer	O
the	O
"	O
bread	O
and	O
butter	O
"	O
of	O
ChuChu	O
Rocket	O
!,	O
and	O
praised	O
it	O
for	O
being	O
easy	O
to	O
pick	O
up	O
and	O
put	O
down	O
.	O
</s>
<s>
Some	O
critics	O
noted	O
problems	O
with	O
lag	B-Application
in	O
their	O
games	O
,	O
as	O
well	O
as	O
difficulty	O
getting	O
logged	O
in	O
.	O
</s>
<s>
Chris	O
Simpson	O
of	O
AllGame	O
said	O
:	O
"	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
Jeff	O
Lundrigan	O
for	O
Next	O
Generation	O
stated	O
that	O
it	O
is	O
a	O
"	O
terrific	O
little	O
puzzler	O
every	O
Dreamcast	B-Operating_System
owner	O
should	O
have.	O
"	O
</s>
<s>
The	O
Game	B-Device
Boy	I-Device
Advance	I-Device
port	O
of	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
The	O
game	O
is	O
almost	O
identical	O
to	O
the	B-Operating_System
Dreamcast	I-Operating_System
version	O
,	O
and	O
thus	O
reviewers	O
generally	O
shared	O
the	O
same	O
thoughts	O
as	O
those	O
on	O
the	B-Operating_System
Dreamcast	I-Operating_System
version	O
.	O
</s>
<s>
Some	O
complaints	O
were	O
made	O
about	O
the	O
D-pad	B-Device
controls	O
being	O
inferior	O
to	O
the	B-Operating_System
Dreamcast	I-Operating_System
's	O
analog	B-Device
stick	I-Device
.	O
</s>
<s>
However	O
,	O
praise	O
was	O
given	O
for	O
the	O
ability	O
to	O
hook	O
up	O
four	O
Game	B-Device
Boy	I-Device
Advances	I-Device
and	O
play	O
multiplayer	O
using	O
only	O
one	O
cartridge	O
,	O
and	O
also	O
for	O
the	O
inclusion	O
of	O
2,500	O
user-created	O
stages	O
uploaded	O
to	O
the	B-Operating_System
Dreamcast	I-Operating_System
servers	O
.	O
</s>
<s>
Minigames	O
based	O
on	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
<s>
were	O
included	O
in	O
the	O
original	O
GameCube	B-Application
release	O
of	O
Billy	B-Application
Hatcher	I-Application
and	I-Application
the	I-Application
Giant	I-Application
Egg	I-Application
(	O
2003	O
)	O
,	O
Sega	B-Device
Superstars	I-Device
(	O
2004	O
)	O
and	O
Sega	B-Application
Superstars	I-Application
Tennis	I-Application
(	O
2008	O
)	O
.	O
</s>
<s>
In	O
Billy	O
Hatcher	O
,	O
such	O
minigame	O
is	O
unlocked	O
via	O
a	O
collectible	O
and	O
played	O
via	O
the	O
GameCube	B-Device
–	I-Device
Game	I-Device
Boy	I-Device
Advance	I-Device
link	I-Device
cable	I-Device
.	O
</s>
<s>
ChuBei	O
,	O
Chuih	O
,	O
ChuPea	O
,	O
and	O
ChuBach	O
are	O
also	O
playable	O
characters	O
in	O
Sonic	B-Application
&	I-Application
Sega	I-Application
All-Stars	I-Application
Racing	I-Application
and	O
SEGA	O
Heroes	O
.	O
</s>
<s>
A	O
sequel	O
,	O
ChuChu	B-Application
Rocket	I-Application
!	I-Application
</s>
