Weightle

Weightle draws an old two-pan balance. On the left pan sits one target object; on the right, one of a counter object, and the question reads, for example, How many grapes balance 1 mango? You set your estimate with a box, buttons that add or subtract 1 or 10 or multiply and divide by 10, and a slider that runs logarithmically from 1 to a million. Then you release the scale and see how far it tips.

The daily set has three rounds that grow in range: Everyday Baseline compares ordinary things, Cross-Domain Mass mixes very different objects, and Extreme Macro Disparity sets small things against huge ones such as a refrigerator, a grizzly bear or a pickup truck. Because answers can run into thousands, scoring works on a logarithmic scale, so being off by the same factor costs the same whether the answer is ten or ten thousand.

After each release the scale tips toward the heavier pan, both pans show their weight in grams, and the game names the exact balance, for example 42.8 US pennies to one slice of pizza. An exact guess scores 100 percent and the score falls away by how many times off you are.

A new numbered set is generated for everyone at 00:00 UTC, and the game keeps a daily streak in the browser. An Endless mode gives random pairings at any time and counts how many rounds you survive. Weightle is made by Julian Schmuck, free to play with no account, and carries a Google ad slot below the scale.