Complete the following tasks to unlock the corresponding effect.
Unlock in Grannie's Attic by collecting Golden Diamonds.
The jump pad to the moon levels becomes available when you beat the first 16 standard levels.
Play as Grannie:
Collect ALL Water Sprites and Golden Diamonds in the normal worlds.
Play as Brown Haired Guy:
Access the Spooky Worlds by entering the mirror in the main hub. Unlock Grannie and then go to Spooky World 3-1 and find the hidden character.