The game starts as the player assumes the role of the game's main character entering a hostile dungeon crawler environment. The player enters a dungeon at the top floor and gradually progresses down through levels of increasing difficulty. Each level is a randomly generated maze of interconnected rooms, filled with monsters, traps, loot, and various objects. The game world is laid out in a tile-based square grid viewed from a top-down perspective, where the player, enemies, and various items and objects occupy discrete squares. The game is turn-based, and both the player and numerous enemies take turns performing actions. Each turn the player may move to or attack monsters in adjacent squares, pick up, drop, and use items, and interact with various in-game objects.
As a role-playing game, the player has several character statistics that determine their effectiveness in various aspects of gameplay. The player begins the game with 7 chosen skills, which may be further improved as the player gains experience levels. The combat focuses on melee, ranged, and magic attacks, as well as use of items and skills. Weapons and equipment can be worn to improve player's defences and abilities. The player carries an inventory of items, which can include various foods, drinks, potions, crafting materials, etc.
Source: Wikipedia, "Dungeons of Dredmor", available under the CC-BY-SA License.