← All three puzzles

Metagons · Arithmagons with playback

1 · Set up the game

2 · Game board

Click a circle, then enter its value (⌫ clear · ↶ undo · ↷ redo). A box turns green when it equals the sum of its two circles.

3 · Gameplay analysis

Based on Arithmagons, a classic school-maths puzzle — see the NRICH version (Cambridge Millennium Mathematics Project).
Self-contained · works offlineFERPA-clean by designVibe-coded, ownable
Editable — click in and revise.