# Cogs — Fraction ratios Puzzle | Mathallery

Source: https://mathallery.com/games/cogs/

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# Cogs

Fraction ratios · 30 levels

Mount gears so the flag turns exactly right.

## How to play

- Tap a gear in the tray, then tap an empty axle to mount it. Tap a mounted gear to take it back.
- The motor turns once ↻. Each mesh turns the next gear driver teeth ÷ driven teeth times as far, and flips its direction.
- Fill every axle so the 🏁 flag gear turns exactly the target amount, the right way round.

A single gear in the middle only passes the turn along. Double gears (big + small on one axle) are what change the speed.

[Open Cogs](https://mathallery.com/#/play/cogs/1)

Teeter, Tint and Echo Heist are free starters. Other games unlock through earned game choices or permanent packs. Your progress stays in the browser; optional sign-in saves it to your website account.