Doppelgänger is a hidden role game designed by Steve Avery and Robert Burke. Each player takes the role of an intrepid adventurer who will help the group overcome great perils. However, some among them are conniving doppelgängers who work against the party to bring their downfall.

Each turn the players confront a challenge that requires teamwork. The party leader selects which adventurers will help him win the encounter. Everyone selected contributes a card to the pool, and others are added from the draw pile. The party leader then distributes one item to each party member to help them in their quest. Success brings rewards and moves the party closer to uncovering the hidden truth. Failure brings pain and moves the doppelgängers one step closer to victory.

Doppelgänger feels like a fast, co-operative dungeon delve, but with the added tension of significant distrust.