Does anyone know what happens if you beat all of the levels on the butterfly minigame? I've gotten up to round 6 and the bonus round after round 5 game me the ectoplasm spell and maxed out my pistol ammo with more on the ground.
Just beat it with the help of the slomo cheat. When you finish the second bonus round it says "You won! Check the stairs for your prize!" and up the stairs will be a shotgun and some shells for it. Then you can just leave the door like normal and continue on with your game.