CurvGuessr is a free daily puzzle about how the world has changed. Every day, everyone gets the same three short rounds built from real historical data from Our World in Data: draw a curve, put a number on an axis and match lines to countries. A game takes 2–4 minutes with no sign-up and no ads.
A free daily browser game, like Wordle but for data. You guess the shape and size of real-world trends such as life expectancy, population, COâ‚‚ emissions or prices, then see what actually happened, why and the source.
Every chart uses data published by Our World in Data, cited with its original source and the date it was retrieved. Each of the 1116 puzzles in the catalog was chosen because its curve tells a story.
A new puzzle unlocks every day at midnight in your time zone. Everyone in the world plays the same puzzle number on the same date.
Each round is worth 100 points, so 300 a day. A drawing is scored on its level and shape against the real curve, the axis round on how many times too high or too low your guess was and the matching round on how many lines you named correctly.
It's free with no ads and no account. Your streak and stats are stored anonymously and a backup code moves them to another device.
Yes. Every past puzzle is free to play in the archive and every chart that has already been played is in the chart library with its full data.
Yes. Predicting a trend before seeing it is one of the most reliable ways to remember data and every reveal explains what happened with a source. It works on phones, tablets and computers and can be played with a keyboard.
English, Spanish, French and Japanese, including every chart title and explanation.
Puzzle #8, November 12, 2026:
Every day, three short rounds built from real historical data. Same puzzle for everyone.
1Draw the curve
You see the title and axes, but no line. Drag across the grid to draw what you think happened.
2Scale the axis
You see the curve, but the numbers are hidden. Turn the dial to guess the value at the marked point.
3Name the lines
Three unlabelled lines. Put each name on the line it belongs to.
Share of people who die in hospital whose body is examined after death.
% of hospital deaths · 1986–2020
Use left and right arrows to pick a year, up and down arrows to set its value, Page Up and Page Down for bigger steps and Enter to lock in.
Drag across the grid to draw the curve. The first point is given.