Advanced Dungeons & Dragons: Treasure of Tarmin is the 2600 port of the RPG video game originally released by Mattel on the Intellivion. The game was written by Tom Loughry and used the Dungeons & Dragons tabletop RPG licence. The game was one of the first RPGs to use first person perspective dungeons and turn-based battles. The formula carried over to many other console and PC RPGs, including future AD&D titles.
The 2600 port was commissioned to Synth Corporation, where Michael Bengtson and Neal Reynolds programmed the game based on the Intellivision version. The game was completed and released just after Mattel Electronics had closed down.
In this game, the player explores a dungeon in which they try to defeat the Minotaur who guards the Treasure of Tarmin. Each level of the dungeon is an 11x11 maze.
In Treasure of Tarmin, the main character has discovered a secret map to the underground lair of the Minotaur who guards the Tarmin treasure. The player must guide their character into the lair to find the treasure.
The player begins the game with the weakest bow, a small supply of food, and arrows. Randomly placed throughout the dungeon are new weapons, armor, magical items, and treasure. The treasure in the maze can either boost the player's score (visible from the map screen), contain a potion (blue, pink, or purple in large and small varieties), or a bomb which will hurt and possibly kill the player.
The player's maximum health and spirit can be increased with potions and special books. The maximum for values are 199 War points and 99 Spiritual points. War or Spirit Tomes can cause the player to regain lost health, as can resting and eating food items. Special gates also exist in the mazes which affect the player’s current points. Passing through a green gate reduces the player's spiritual health and boosts health, while passing through a blue gate increases spirit and reduces health.
Enemies in the dungeon included skeletons, giants, giant ants, dwarves, giant scorpions, giant snakes, alligators, dragons, ghouls, wraiths, and the Minotaur. If the player dies, the game is over except in certain cases in which the player is reincarnated in another section of the maze with all their inventory removed.
Even after defeating the Minotaur, the player can continue to explore the dungeon. Using ladders, the player can descend to level 255 after which the game loops back to level 1.