Press Select + Start + A + B.
Begin a game in two player mode and intentionally allow player two to die. Move player one over the icon that represents player two's supplies to collect them.
Escape stun square
Press Start to pause the game. Resume game play and jump off the square to avoid damage.
Continue game play
Begin game play in two-player mode. Quickly press Start when losing a life, while the other player still is playing to rejoin the game with another character.
Clues can be found in rooms 16, 26, 46, 54, 66, 70, 81, and 90. To pass Merlin, collect all of them.