The following are known Action Replay Codes for Teenage Mutant Ninja Turtles 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
ea6654e4
e8fd4860
b2efd7ae
8a97f233

Infinite Health
34a95d90
986a1a16
eb581111
ecb3b425

Invincibility
56a7fe7c
80746af6

1 Hit Kills Bosses
584f251a
7192b25d
42435ec6
d4994b16

1 Hit Kills Enemies
7cacb4a5
9a963c17
3da9c752
69bfd179