Eye of the Beholder is a real-time RPG dungeon crawl that borrows heavily from the mechanics of Dungeon Master. It's a completely mouse-driven experience in which the objects in the environment can all be used, picked up or thrown with a click. Combat is also real-time and is generally just a mad scramble backwards as you click your various party members' weapon hands and hope for "good rolls".
While the fights are frantic and fun, the real meat of the game-play is exploration, mapping, and puzzle solving. I went through a dozen sheets of graph paper drawing out each floor knowing full-well I could just grab the maps from the Web (the GOG.com version even includes a complete hint book). As tedious as it might sound to modern gamers, the act of plotting out the layout is oddly satisfying. I wish it could be done in-game à la Etrian Odyssey, but, if it's any consolation, I now have 11 floors worth of half-erased, taped together graph paper maps that are suitable for framing. Perfect for any lair!