Lantern of D'Gamma

Third in a series of "Eduventure" educational adventure games by Milliken Publishing. The protagonist must follow in the footsteps of an ancient king, Louis D'Gamma, by seeking the clues he left behind in his search for the person who betrayed him - clues that lead to the solution to the ancient mystery and to the king's legendary treasure. The key to retracing his steps is his lantern, which must first be found.

This game is a typical text adventure, reacting to typed commands, except that some of the puzzles are mathematical in nature. One puzzle is even randomly generated and reveals necessary, also randomly generated information when completed, thus requiring some mathematical skill even when using a walkthrough. - MobyGames