Incredible Machine: Even More Contraptions [cheats]
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 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.
On Christmas Day a Santa Claus lamp will appear in the part bin. It works just the same as the lava lamp just shaped like Santa.
Secret Valentine's Day Object
Play the game on Valentine's Day to unlock a Cupid part. It flies in a straight path like a blimp, but it can pop things with its arrow.