Definitely Not Doppelgangers is a silly fantasy game, ideally played over one or two sessions, each lasting around 2-3 hours. It is for 2-6 players, one of which is the GM. The goal of the game is to maintain your disguise by acting like the person whose identity you have taken, and keeping suspicion off yourself through many convoluted webs of lies. The roleplaying can be funny and exaggerated, while the lies told on the fly should be outlandish and creative. Suspicion should be communicated by words, tone, and body language, as should shocked reactions to accusations of being a doppelganger.