Odd One Out: General Knowledge — Rules & What Counts
Four options, one impostor, ten rounds — but here the categories roam everywhere: planets, chemical elements, string instruments, German car brands, Olympic sports, Shakespeare plays, mammals, bones. Each question names the category; you tap the one option that doesn't belong.
It plays like the best pub-quiz moments: everyone "knows" Pluto, HTML and the penguin — right up until they have to commit. Every round closes with a one-line explanation (Pluto has been a dwarf planet since 2006; bronze is an alloy, not an element), so the quiz doubles as a rapid-fire fact refresher.
How to play
Each round asks "Which of these is NOT a …?" — tap the option that doesn't fit the category.
One pick per round, no retries — a wrong tap locks in and the real answer lights up.
A short explanation appears after every round, whether you were right or not.
The timer counts up from your first pick and only matters for beating your own best.
Use "Review rounds" on the results screen to re-read every explanation afterwards.
What counts in this quiz
10 rounds per run from a wider pool of categories — science, music, sport, literature, food and anatomy all rotate in.
Categories follow the standard definitions: the IAU's eight planets, the periodic table's elements, the Olympic programme as it stands.
One point per impostor found; 10/10 with a fast clock is the run to chase.
What's not included — and why
No opinion questions — every category has a factual, checkable membership (no "best" or "most famous").
No double-impostor rounds — exactly one of the four options is always out of place.
Good to know
When Pluto was reclassified in 2006, the demotion vote happened on the last day of an astronomy conference in Prague — most attendees had already flown home.
HTML is a markup language, not a programming language — it describes what a page is, not what it does, which is exactly why it's this quiz's favourite trap.
The platypus is such an odd mammal that when its skin first reached London in 1799, scientists inspected it for stitches, convinced it was a hoax.