The following are known Action Replay Codes for ChuChu Rocket! on SEGA Dreamcast (Dreamcast). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

(m)
4E0C0656
71C89AC8
FA997735
BD90C6A5

Player 4 have a score of 0
E0571868
00000000

Inf Time
A2A59726
B117DC15

Player 3 have a score of 999
9E680A0B
000003E7

Player 2 have a score of 999
626B6BBD
000003E7

CPU score 0
7B0591F1
5501D81A

Player 1 have a score of 999
1684166D
000003E7

AR Button for Slow
78960794
27667199

Infinite time
DDC88320
0000582D

Player 3 have a score of 0
9E680A0B
00000000

Player 1 have a score of 0
1684166D
00000000

Player 2 have a score of 0
626B6BBD
00000000

Player 1 score 99
E30C8E96
ED201BFF

Player 4 have a score of 999
E0571868
000003E7