Lode Runner 3-D
Bonus Levels
Pause the game, then hold Z and press C-Down, L, R, L, R, L, R, L, R, L, R. If you entered the code correctly, you will hear a sound. Then, highlight the new "Enter Secret Worlds" option that appears and press A to play the new levels.
 Bonus Levels
 Level Select
Level Select
While in a level press Start to pause the game and hold the Z Button. While holding Z, press R, B, A, B, A, C-Up, C-Down, C-Left, C-Right, C-Up, C-Down, C-Left, C-Right. A tone will sound and the option "Unlock Worlds:" will appear. Highlight the option and turn it to "Yes" to access all of the worlds.
Credit Goes To: Bowen Devore via IGN 64