MagicEngine

Cheat Menu:
At the title screen, press Up, left, down, right, II, I for a cheat menu with options to change lives and levels, and for a sound test.

Level select:
At the title screen, Press II, I, II, II, I, II, then hold Select and press Run.
Once entered, the Sound Test will change to a Stage Select. It only goes up to stage 3, but if you hold ...

Level select:
Press Left, Left, I, Right, Right, II, Up, Down, Up, Down
After entering the code, use up and down to change the world number from the bottom left corner.

99 continues:
Hold II + Run and repeatedly tap Left after losing your last life to gain up to 99 continues.

At the title screen, enter any of the following codes.
Stage Select:
I, II, I, II, II, ...

Multiple Continues:
At the Game Over screen, set I on low turbo then hold down I and Select while pressing Left repeatedly.

Level Select:
At the title screen, press Left, Left, I, Right, Right, II, when the beep sound ends, press and hold Select + Run.

Continue:
When the Game Over screen appears, hold I and II, then press Run.

Hidden level warps:
Locate the brick bridge on level 1-4B. Kick the right corner of the bridge and underneath. This wil ...

Refill life meter:
Enter this code when the game is paused.
Left + Select + II