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Catculus

By Antti Haavikko · 2025

Play:

Touch: Tap PLAY, then drag a finger across adjacent tiles to select them; lift to submit. Tap to pick bonuses. · Keyboard: Mouse: click and drag across tiles.

About:

An arithmetic puzzle from js13k 2025, where it placed 6th overall. Each round shows a target number: drag across adjacent tiles that add up to it. Overshoot and you lose some of your life bar. The board grows as you go, black cats curl up on tiles and hide what's under them, so you have to remember the grid or take a guess, and every so often you pick a bonus that changes how scoring works. It's quick, cute and gets harder the longer you last.

Credits:

Made by Antti Haavikko, 2025. Published here under the MIT licence. Source code.

Phone check: 2026-09-29

Rate this game:

One vote per game each month.

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Tags:

puzzle · math · memory · cats · js13k