3D Realms - Crystal Caves: The official Crystal Caves page, from its creators. There is a link to purchasing the game.
Crystal Caves: Provides downloads, screenshots, cheats, and links.
GameFAQs: Crystal Caves: Reviewed by KBroccoli, 6.5/10. "A more thorough gaming experience than the Commander Keen saga, it's a perfect little game for the fans of that kind of PC gaming or those after a touch of nostalgia."
