The player again arrives into the city of RHEM, with a note from Zetais who studied the artifact in RHEM 2: The Cave. Kales uses the note given by the player to unlock a gate leading to the inner area of RHEM. The game's overall plot is not fully revealed until the player comes back to this area after solving a large number of puzzles.As stated in the game's title, in order to solve most of the major puzzles, the player must first find and enter a "hidden library", a jumble of rooms containing roll doors and books on shelves. The books themselves contain hints to solve the other puzzles.The player's goal is to find 10 green crystals scattered throughout RHEM, much like the other two games, in order to unlock the passage to a black crystal.
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