Little Secret is a game in which you have to uncover intruders. To verify the identity of the participants in a meeting of a secret organization, you need to know the secret word, and only the disciples have the correct word. Hidden amongst you are infiltrators and a lone journalist who want to remain unrecognized. Can the disciples unmask them all?

To play, each player receives a card with secret words that define their role in each round of the game. Your role might change from round to round. If you lack a secret word, then you're a journalist; if you have one, you're either a disciple and an infiltrator, but you don't know which.

In turn, each player gives a clue to their secret word, the aim being to find out who has a different word than theirs — or no word at all in the case of the journalist. All players then debate and vote on who to eliminate, after which the game continues with remaining players giving a new clue until either only disciples remain or only two players are in the game. Players who have not been eliminated earn points.

The U.S. edition of Little Secret from Exploding Kittens changes the groups to good kitties, confused kitties, and a spy pup, but otherwise gameplay remains the same, with each player card having enough clues to play 21 games without needing to shuffle or re-deal.