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The Plastic Key is a key in the game Ib. It is a yellow, crayon-drawn key used inside the Sketchbook to open the door to Mary's house. To find it, Ib and Garry must solve the Switch Puzzle, pressing the eight switches in the right order so that the key will appear in the center of the room. The key can open the door with the heart symbol in the northern quadrant of the Sketchbook, leading into Mary's house where the Toy Box sits.