The following are known Action Replay Codes for Mario vs. Donkey Kong 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
1df4cab1
623711b8
24563f1f
6d6b8ca9

Infinite Lives
37ea817f
fc3f8e73

Infinite Level Time
a111c9af
68666942

Infinite Key Drop Time
ad4c10e4
a207fc14

Infinite Health in DK Fights
dedbd313
5f1a137d

1 Hit Kills DK
213816f7
8b7b8201

Awesome Super Jump
012f2702
ae7cf123
897395b2
a8db0778
df97744b
d9972159

Save 1: All Levels
ee15f697
f31b339e
4ccc6a8e
1c121bb9
023a0a89
f7dff0d4

Save 1: All Movies
6cd5e5e5
0a65f774

Save 2: All Levels
9a2147f7
7ee38ec7
6a0dd70e
b6f70b9a
023a0a89
f7dff0d4

Save 2: All Movies
c070dc6d
951dfd30

Save 3: All Levels
14f4855b
e3fd7b89
51bd640e
57a908e9
023a0a89
f7dff0d4

Save 3: All Movies
2ebd0359
ab0d9390