Four words. Three belong together, one does not. Tap the impostor. Three lives, and the streak is yours to lose.
18 categories · endless
Each round gives you four words. Three of them belong to the same category — birds, metals, capital cities, dances — and the fourth is from somewhere else entirely. Tap the one that does not belong. Get it right and your streak grows; get it wrong and you lose one of your three lives.
Rounds are built fresh from 18 categories rather than drawn from a fixed list of puzzles, so you can play for a long time without repeating yourself. After every answer you are told which category the other three shared, so a wrong guess still teaches you something.
You get four words. Three of them belong to the same group and one does not. Tap the one that does not belong. Every correct answer extends your streak, and you have three lives.
Yes, completely free. No signup, no download and no app. It runs in your browser on a phone or a laptop, and your best score is saved on your device.
Each round is built fresh from a large set of categories rather than pulled from a fixed list of puzzles, so you can play for a long time without seeing the same four words twice.
Most people get somewhere between 7 and 12 in a run. Getting past 18 is a genuinely long streak.
More to play: Herd Memory, Guess the Year, or all solo games.