Treasure of Tarmin

Treasure of Tarmin is a 1982 Intellivision game from Mattel, catalogued here for 4 defining game mechanics.

Intellivision1982Complexity 36/1002D FirstpersonCult classic

Advanced Dungeons & Dragons: Treasure of Tarmin is a 1983 first-person dungeon-crawler by Tom Loughry for the Intellivision. (via Wikipedia)

The genre Treasure of Tarmin helped define

First-person dungeon crawler. An early first-person, grid-based console dungeon crawl with inventory and combat depth.

Real Time Action CombatCombatCombat resolves continuously in real time; player inputs compete directly with enemy behavior each frame.
Consumable ItemsResourceItems are permanently destroyed or depleted on use; scarcity creates tension and opportunity cost.
Inventory ManagementResourcePlayer holds a collection of discrete named items with defined slot limits; deciding what to carry is a meaningful choice.
Tile Map WorldWorldWorld is built from a grid of discrete terrain tiles; position on the grid is the primary navigation primitive.

Each mechanic links to how to build it in Godot, with the retro games that share it.