Practice mode:
Enter 9005 as a password to practice in any stage and level except for the Bosses and Master.
Level
Password
Jammin' Jungle
Stage 1 (none)
Stage 2 6800 Stage 3 5120 Boss 7420 Vexin' Volcano
Stage 1 4501 Stage 2 8111 Stage 3 7421 Stage 4 1051 Boss 3351 Slammin' Sea
Stage 1 4502 Stage 2 8112 Stage 3 7422 Stage 4 1052 Boss 3352 Crankin' Castle
Stage 1 0513 Stage 2 8114 Stage 3 9723 Stage 4 3353 Boss 5653 Thrashin' Tundra
Stage 1 2814 Stage 2 8115 Stage 3 1134 Stage 4 5654 Boss 7954 Cruisin' Comet
Final stage 0515
Hint: Set off all bombs:
During battle mode, walk in one direction and quickly press C(2) to set all of your bombs at once in a row.