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

These codes are for the U.S. version of the game.

Master Code – Must Be On
f5921e7f
c8023240
bd29608e
c53a9f5e

Infinite Time
ead7c003
501e3480

Player 1 Score 99
12a6200b
5e874622

CPU Score 0
4590f6f5
aa02ccb7

Infinite Rockets (Create)
6cc2a454
5dc632b6
2fcb4795
490e0d42

Normal Complete
906dcc31
c7ba343d

Hard Complete
c5da05cd
921611ff

Special Complete
fe1754a4
e94cca95

Mania Complete
0789781a
32158dcf

Infinite Timer Challenge
8ed347f5
5c438e39

Last Level Win Challenge
6798753a
e3d4f057

Challenge Complete
e2d62661
a2531e9c

Press AR Button: Slow
dbba3a89
4cb74b94