For grown-ups
This is proportional reasoning and unit rates as the game itself. The rules use exact fractions. Each level’s weight (1–5) is measured by a small bot that tries every machine count — never guessed. No timer, no score; progress stays on this device.
What it never does
- No accounts, no ads, no tracking — progress stays on this device.
- No streaks, timers-to-beat, points to chase or leaderboards.
- No chat, and nothing your child makes is sent anywhere unless you choose to.