Ballometry

Ballometry is a free browser game about sports numbers. Each day brings one edition of five rounds, the same for every player on a UTC date, and each round is a chart drawn from real results: a player's season bests, a team's wins, a driver's podiums. Part of the line is shown and part is shaded out, and your job is to draw the shaded part.

The edition for 6 November 2026 opened with Usain Bolt's fastest 100 m time in each season from 2007, with everything after 2013 hidden. Tennis, basketball, ice hockey and Formula 1 followed. Edition 007 on 7 November began with the points scored by the losing side in every men's Rugby World Cup final since 1987, then moved on to tennis, football, Formula 1 and baseball. Some rounds ask what happened next, so you carry the trend forward. Others hide a stretch in the middle, and you fill the gap between two known parts.

Scoring is plain. Each round is worth up to 100 points. The game averages how far your points sit from the real values and compares that with the chart's height, so a miss of 40 percent of the range or more earns nothing. After each reveal you see both lines side by side, your average miss in the chart's own units and the source of the data. The about page credits open datasets such as OpenFootball, FiveThirtyEight, F1DB, Cricsheet and Wikipedia.

There is no timer and no account. Progress, streaks and results by sport are kept in your browser, with a backup you can export. A separate practice mode keeps its own scores. It suits sports fans who like numbers and anyone who enjoys guessing a trend more than naming a player.