The following are known Action Replay Codes for Britney’s Dance Beat 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
cabd8cd2
e7604faa
1905750c
95b74620

Have 999 Greats
a74b9c5f
258c469d

Have 0 Goods
b8fe8e66
ea0365cf

Have 0 Boos
e99761c0
3954c49c

Unlock Levels / Puzzles
c7e91fc6
8e7fe4fe

Unlock Videos / Bonus
0c6a198c
3faebbb0