# Crease — Adding up Puzzle | Mathallery

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

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# Crease

Adding up · 30 levels

Fold the number strip until it matches the target.

## How to play

- Tap a crease to fold the strip there. The shorter side flips over onto the longer side (equal halves: left flips onto right).
- Numbers that land on top of each other add up. Match the target strip exactly, reading left to right (a backwards copy does not count).
- From level 16 the paper's back is red: a folded cell subtracts, so a cell becomes bottom − top.

Look at the target's length first: it tells you how much paper has to be folded away. The arrow under each crease shows which way it folds.

[Open Crease](https://mathallery.com/#/play/crease/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.