In Dungeon CompAInions, the player can choose one of three playable classes: Mage, Druid, and Ranger. Each character comes equipped with a main attack weapon and two powerful abilities, which must be used strategically and wisely. The two remaining classes not chosen by the player will be controlled by agents trained through Reinforcement Learning and will accompany the player throughout their journey.

Together, the player and their AI companions must clear rounds composed of multiple enemy waves. Each round consists of five waves, which are triggered continuously during gameplay—unless the player decides to activate the pause button midway through the round. Pausing the game will damage, potentially even kill, the player. This allows for clearing the remaining enemies and helps with not being overrun by hordes of undead. The player will get score for every initiated wave, stacking up with the number of waves cleared without pausing. Thus, the player should choose wisely between staying safe and pausing the game, or being greedy and trying to clear all enemies without a moment of peace.

After completing a round, the player will be presented with three reward options, from which one may be selected. These rewards include upgrades to Attack Damage or Ability Damage, increases in Max Health, reductions in cooldown times, or boosts to movement speed. These upgrades are essential for survival and success.

With every subsequent round, the game becomes progressively more challenging. Enemy strength increases, spawn rates accelerate, and wave intervals become shorter—down to a predefined minimum. This creates a dynamic balance between becoming stronger and facing ever-larger groups of enemies, ensuring the player is constantly tested in both strategy and combat efficiency.