Every round shows four options — three that belong to a category and one impostor. The question tells you the category ("Which of these is NOT a country in Europe?"), and your job is a single tap: pick the one that doesn't fit. A run is 10 rounds drawn from a larger pool of geography categories — continents, capitals, landlocked countries, island nations, borders and more.
The traps are the point. Guyana sits next to Ghana and Guinea in your memory but lies an ocean away; Sydney and Istanbul feel like capitals and aren't. Each round ends with a one-line explanation of why the odd one is odd, so a miss always teaches you the fact you were missing.
How to play
Read the category question, then tap the option you think does NOT belong.
You get exactly one pick per round — there are no second guesses, so think before you tap.
Right or wrong, the answer is revealed with a short explanation before the next round starts.
The timer counts up from your first pick; it's a stopwatch for bragging rights, never a countdown.
After the results screen, "Review rounds" replays every question with the correct answer and explanation.
What counts in this quiz
10 rounds per run, drawn and shuffled from a wider pool of categories — repeat runs mix in different members and impostors.
Every option is checked against the category as commonly defined: UN-member countries, official national capitals, the five Nordic states, and so on.
One point per correctly spotted impostor; a perfect run is 10/10.
What's not included — and why
No trick overlaps — an impostor is never arguably inside the category (you won't be asked to call Kazakhstan "not European" or Denmark "not an island nation"; borderline cases are simply not used).
No repeat of the same category twice in one run — each round tests a different set.
Good to know
Guyana is the only English-speaking country in South America — one reason it so often gets mentally filed next to African namesakes like Ghana and Guinea.
Rio de Janeiro was Brazil's capital for nearly 200 years before Brasília — a city built from scratch — took over in 1960.
Bolivia still maintains a navy, over 140 years after losing its coastline to Chile in the War of the Pacific.