Fourfold · Echo Stones
One quiet move, one powerful echo. Play Shōbu across four little boards: slide a stone on a home board, repeat its exact direction and distance on an opposite-color board, and push every rival stone off any one board to win. Local tactical opponent, two-person play, three study endings, hints, undo, keyboard/pointer controls and device saves. Browser adaptation of https://github.com/OpenShobu/Universal-Shobu-Protocol-Specifications/blob/4178b90af66d3834b465b6e9491f1f6c261c87ab/examples/javascript/engine.mjs (Apache-2.0; 1 star observed; updated October11,2026). Metadata tags: github-source, game.
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