Suido水道

const made = makeSuido({ size: 8, difficulty: 70, seed: 7 }) // a board with exactly one answer
checkSuidoAnswer(made.code, made.answer) // { ok: true }
flowOf(layout, masks).wet // where the water has got to
turnAt(game, cell) // a tap: one piece, a quarter turn
drawSuido(layout, { masks }) // the board as SVG text