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+* Jukebox
+
+* Level
+
+* Player Object
+** Player Robot
+
+* World
+
+* World Object
+** Interactive Object
+*** Block
+**** Movable Block
+***** Colour Block
+**** Immovable Block
+*** Water
+*** Lever
+*** Rolling Stone
+*** Laser Beam
+*** Mirror
+
+** Non-Interactive Object
+*** Background Tile
+*** Effects