Impostor

Impostor is the sharpest reflex test on the site. Five Pokémon characters appear, four of them share something, and one does not — you tap the odd one out. The catch that makes it hard is that the game never tells you what they share until you get it wrong.

The categories are drawn from real character data: gym leaders, regional champions, the Elite Four, coordinators, professors, villainous teams, Team Rocket, Ash's companions and rivals, trainers from Kanto, Sinnoh or Alola, fire- and water-type specialists, legendary owners, powerhouses above eighty power, and Pokémon rather than humans. Working out which of those is on screen is most of the puzzle.

Each round lays out five portraits. Four match a hidden category and one is a deliberate outsider. Tap the outsider and you score; tap a matching character and the run ends immediately, with the category and the real impostor revealed.

There is a fifteen-second clock on every round, and it doubles as your score: a correct tap is worth one point for every three seconds left, so a fast read is worth up to five points and a slow one barely one. Let the clock hit zero and the run is over. If you would rather think than race, the timer can be switched off from the header.

A correct answer immediately deals a fresh set of five and your streak climbs until you miss. You get eight runs a day, and the daily leaderboard ranks every run you make rather than only the good ones.

Look for the majority before you look for the exception. Four faces that obviously belong together define the category, and the fifth then stands out on its own — hunting straight for the odd one usually means testing five characters against a rule you have not worked out yet.

Run through the category types in order of how visible they are. Role comes first: gym leaders, champions, the Elite Four and professors are recognisable at a glance. If the group does not resolve that way, try region, then signature type, then the numeric ones — a set built on "power level above eighty" or "owns a legendary" looks like a random group of strong trainers until you think of it.

Beware sets where the outsider is famous and the four are obscure. The impostor is picked at random from everyone who does not match, so the character you recognise fastest is not more likely to be the answer — and with one mistake ending the run, a two-second sanity check is cheaper than a restart.