Suido 水道 — Pipe-connecting puzzle

const rows = await loadSuidoLevels("8x8") // 256 levels, easiest first, each with exactly one answer
const big = await loadSuidoBigLevels() // 64 levels with big 2×2 pieces among the ordinary ones, easiest of all to hardest
SUIDO_PIECE_GUIDE // every piece, with a board to draw it on: drawGuidePiece(piece) is its picture
loadSuidoLevels("28x28") // the huge boards: 20×20, 28×28 and 20×50, sixty-four levels each
checkSuidoAnswer(rows[11][0], levelAnswer(rows[11])) // { ok: true }: level 12's board and its answer
declaredTwists(rows[239]) // ["walls", "locked"]: what level 240 asks beyond turning pipes
const made = makeSuido({ size: 8, kind: "inlet-outlet", locked: 3, walls: 4, seed: 7 }) // a board of your own
makeSuido({ size: 12, bigs: 6, blocks: 4, seed: 7 }) // with big pieces and squares that turn as one
flowOf(layout, masks).wet // where the water has got to
turnAt(game, cell) // a tap: one piece, a quarter turn (a locked piece stays)
drawSuido(layout, { masks }) // the board as SVG text, and drawSuidoThumb(layout) for a small one
mountSuido(element, { code, answer, hints: true }) // a board to play, by tap, mouse and keyboard, with the water flowing
<suido-board size="8x8" level="12" chips hints></suido-board> // the same in a tag
dailySuidoLevel("8x8", new Date()) // the level of the day at 8×8, the same for everybody
openSuidoLevels("8x8", solved) // 16, 32, …