It's a free online party game for 3–20 players, also known as Undercover or the Imposter Word Game. Everyone secretly sees the same word on their phone — except one impostor, who only sees a vague hint. Players take turns saying one clue word each; the group tries to expose the impostor, and the impostor tries to blend in and guess the secret word.

Listen to everyone's clue words. Players who know the secret word give clues that clearly relate to it — the impostor has to bluff from just a hint, so their clues tend to be vague or slightly off. Discuss, accuse, and when the group has decided, the host taps Reveal.

No download needed — the Impostor Word Game runs right in your phone's browser. Just open the page and share a room code. It works on iPhone and Android instantly, with no app to install.

Yes, completely free. There's no sign-up, no app to install, and no payment. Just open the page in any phone browser and share a room code with your friends.

At least 3 players, up to 20. One person creates the room and becomes the host; everyone else joins with the 4-character room code or by scanning the QR code.

Seven categories: Food, Animals, Places, Everyday Objects, Movies & TV, Football and Super Heroes, each with dozens of words. The host picks a category before every round, and each word comes with two vague hints, one of which the impostor is shown at random.

Yes — two ways. Stay undetected until the end of the round, or work out the secret word from everyone's clues and say it out loud before being exposed.

Yes. Pick Pass the Phone in the lobby and one phone goes round the group: each player swipes their card over, sees their word or their impostor hint in private, and hands the phone on. Type everyone's names in once and the list is remembered for next time. The default mode, Everyone has a Phone, still gives each player their own screen. Either way the clue-giving and accusing happen out loud in the same room.