Each round shows four actors. Three of them starred in one film together; the fourth was never in it. Tap the impostor. It sounds easy until the impostor is someone who feels like they were in the film — and the game enjoys that feeling.
The daily is identical for everyone. Free Play deals unlimited rounds, and Eras mode keeps every round's film inside your chosen decade — spot the impostor among the casts of 1990s cinema, if you dare.
Start from the film, not the faces: if you can guess what the shared film might be (two of the four actors often give it away), the impostor falls out immediately. Beware of typecasting traps — the impostor is frequently an actor from the same genre neighbourhood who plausibly could have been in the film. Age math helps too: if three careers overlap neatly in one era and the fourth peaked a decade earlier, you have your answer. Every round is generated so there's exactly one defensible answer — no film contains three of the four except the real one.