Keys are objects that can be used for opening Gates or serve as objects that can be picked up creatures. Five types of Keys exist in Adventure Creator, Red, Blue, Yellow, Green and White Key. A Blue Key can only open up Blue Gate, not a Green Gate. Like other objects in the game, Keys be in their normal form, be invisible (though highly impractical), or being disguised as something else, i.e. a cake. Keys can also play vital roles besides opening Gates, for example, it could be used a object of importance. You could set the mission goal to give a key disguised as a cake to a creature to complete said goal.