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About PlayMemorize Order by Size

PlayMemorize Order by Size is a free size-ordering game. Several items from a category - planets, animals, mountains, countries, buildings, or bodies of water - appear in random order; you tap them smallest to largest. One wrong placement ends the round and reveals the true sizes.

Six categories. Planets by diameter, animals by length, buildings by height, mountains by elevation, countries by area, bodies of water by area. Each round mixes only inside one category, so you're never asked "is a giraffe taller than France".

Adjustable difficulty. Easy mode spreads picks across the full size range of a category · Hard mode bunches them so the differences are tiny (Eiffel Tower 330m vs Tokyo Tower 333m).

Part of the PlayMemorize family of free brain-training games. Runs entirely in your browser, works offline as a Progressive Web App.

よくある質問

Q: How does Order by Size work?

Several items from one category appear in random order. Tap them smallest to largest. After your last tap the game reveals the true sizes and your streak advances if you got them all right.

Q: Which categories are included?

Planets (by diameter), animals (by length or height), buildings (by height), mountains (by elevation), countries (by area), and bodies of water (by surface area). A round only ever mixes items from one category.

Q: How does difficulty scale?

Easy mode samples items from across the full size range of a category, so the differences are obvious. Hard mode samples a tight window so the items are similar in size and you have to know the actual numbers.

Q: Are the sizes accurate?

Yes. Planet diameters, building heights, mountain elevations, country areas, and water-body areas all come from the standard reference figures. The data file is plain TypeScript - corrections welcome.

Q: Is it free?

Yes, completely free. No account, no ads, no paywalls. Best streaks are saved locally in your browser.