Unlabeled

What Unlabeled is

Unlabeled is a daily web puzzle built around real open-data charts. Each day you are shown four charts with their axis labels stripped away. The numbers on the scales remain, and your job is to read those scales, work out what each chart is likely measuring, and match every axis to one of the available labels. You have four attempts to place all the labels correctly, and each wrong submission gives you feedback so you can refine your reasoning before trying again. Every chart comes from a named open-data source, so you can look up the original material if you want to verify your interpretation after solving.

How to play

Start by studying the numbers on each chart's axes. The values themselves are your main clue — a scale running into the hundreds of millions suggests a different subject than one that tops out at a few dozen. Think about what kind of data would plausibly produce the shape you see, then assign a label to each axis. Submit your proposed set of matches. If the set is wrong, you still have remaining attempts to adjust your choices. When you finish, or if you want to learn more, each chart's named open-data source is available for you to check.

Tips

1. Read every scale carefully before assigning anything; the range and spacing of the numbers often tell you more than the curve itself.
2. Use the archive of previous charts to practice reading unlabeled axes at your own pace, without the pressure of the daily attempt limit.