Often, solving one part of the puzzle will reveal items, codes (passwords), or pathways that in turn that help solve another part of the puzzle. The aforementioned cupboard, for example, yields a screwdriver, and the screwdriver is used to unscrew the painting, which yields a screw in return, and so on. The player must often apply lateral thinking when trying to find uses for the items retrieved in order to solve the puzzles. Codes can be in a variety of formats, usually involving simple number sequences but can also be as complex as involving colours, directions and binary; these must be entered into the appropriate elements inside the game's environment correctly in order to advance through the game.