A Bug's Life
Level skip
2. 9LKK
3. 5P9K
4. 6652
5. BKK2
6.2PLB
7.6562
8.L58B

Avenging Spirit
Master Mode
This code makes all enemies harder to kill, plus they do more
damage. When the title screen appears, simultaneously press Up, B,
and A. If you did the trick correctly, you'll hear a tone. You can now
play the Master Mode.

Blast Master Boy
Stage Select
Blast to any stage in Blaster Master Boy with the easy trick. When
the title screen appears, choose Continue. Press and hold Button A,
then press Start. When the Stage Select Screen appears, use your
directional pad to choose any stage.