# Checkpoint — Divisibility Puzzle | Mathallery

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

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# Checkpoint

Divisibility · 30 levels

Couple digit wagons so every tunnel lets them pass.

## How to play

- Tap a yard wagon to couple it to the end of the train. Tap a coupled wagon to uncouple it.
- Tunnel k checks the first k wagons as one number: 38 passes ÷2 because 38 ÷ 2 is whole.
- Couple every wagon so all tunnels glow green. A train can't start with 0.

Tricks: ÷2 ends even · ÷5 ends in 0 or 5 · ÷10 ends in 0 · ÷3 / ÷9: the digits add up to a multiple of 3 / 9 · ÷4: the last two digits do · ÷6: even and ÷3 · ÷8: the last three digits do · ÷1 lets anything through.

[Open Checkpoint](https://mathallery.com/#/play/checkpoint/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.