The Game Genie code SKKLUKXT enables an input code to access a level select. On the screen to select the amount of players who will play (1 Player, 2 Players), enter the following code:
- Right, Left, Down, Up, B, A
If done correctly, you will hear a tone. Choose your character as normal and you can pick every level in the game, except for 6-3, curiously. Note that 6-3 can be selected, but it will not bring you there. The controls are as follows:
- Hold B, then press Up or Down to change the world number.
- Hold A, then press Up or Down to change the stage number.
- Start leaves the screen and takes you to the desired level.