The following are known Action Replay Codes for Tetris Worlds 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
bed035c0
d200ad8e
a05079ab
36f7ec70

Infinite Time
6cc92af9
20cc9eea