How big is
your intuition?
Seven targets. One daily puzzle. About three minutes to discover how well you know the scale of the world. Get close and let your plane climb.
How to play
7 targets · ~3 minutes · daily
Read the target
Choose an answer whose value feels closest to the target.
Get closer
You do not need an exact fact. A good estimate is what counts.
Learn something
See the real values after each round, compare with friends, and return tomorrow.
A world worth estimating
Mountains, rivers, islands, country areas and elements. Explore the scale of the world.
Heights & lengths
Compare mountain elevations and river-system lengths.
Land & water
Estimate island areas and World Bank country surface areas.
The building blocks
Match elements to their atomic numbers.
Questions
A small daily ritual — Plain rewards a feel for magnitude rather than perfect recall. Everyone gets the same daily puzzle, with no endless feed.
Where do answers come from?
Our category lists use Wikipedia, World Bank and PubChem. Each value has a source and an import check date.
Is this the original game?
plain game is independently built, inspired by playplain.app. Play here in English or Simplified Chinese; our puzzles and scoring run on this website.
Is it free?
Yes. Daily and practice flights are free, with no account required.