The Incredible Machine: Even More Contraptions Cheats - PC
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Easter Egg: Another Hidden Build Object
A bat appears when you are building your own contraption on Halloween. When it gets hit with a ball, it flys around.
Hidden Part
On Halloween (October 31) you get an extra part, a glowing Jack-O-Lantern. It can be lit using a match, laser, or other ignition device. It can also be used to scare the cat, if the cat comes near it.
Hidden Build Object
A Leprechaun appears when you are building your own contraption on St. Patrick's Day. When he gets hit with a ball, he dances.