I found three of the real owls needed to get the anticube and open the secret door in the graveyard world. Throughout the game, there are four owls perched on trees in the levels. if you go up and press B next to them, they will fly away and you'll be able to see them at the owl statue that follows you in the graveyard. Get all four to get an anitcube and unlock the secret door there. There is one in the tall tree with bouncing mushrooms, one in the first warp zone hub, and one near the windmill. Anybody know where the last one is?
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