The following are known Action Replay Codes for Mat Hoffman’s Pro BMX 2 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
8a5c1962
e8e063d2
652accf5
5ef1d41d

Max Score
1222b112
13c5228f
cfc97cf2
eaf98cc6