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SubTerra is a freeware 2D action/puzzle game by independent developer Pieter Simoons (a.k.a Radiant) of Crystal Shard Games, in the style of classics like Boulder Dash, Emerald Mine and Supaplex. You move a gnomish-looking character through a 'mine', usually a maze, but sometimes a more complex puzzle, collecting as many gems as you can. Sounds simple?