NetHack for Linux

From Nethack:

NetHack for Linux is a free rpg game. A popular single player dungeon exploration role playing game similar to Moria, Angband, Omega, Rogue, and other MUD's. Nethack was created back when GUIs were brand new and the text-based games ruled. Hack is one of the first to come out. Get a blast from the past and spend many a night guiding your character through dungeons, eating corpses, killing newts, raiding Dwarven mines and much more. The redrawn and random dungeons and countless types of enemies make it exciting with massive replay-ability. Find powerful potions, rings and scrolls and the special effects they produce. Naming your pets and tamed monsters makes Nethack an old school gem to be appreciated forever.