The mechanic
builder.multiways({ minRows, maxRows, reelPixelHeight }) switches the
reel set to MultiWays mode. Every spin must call setShape(rowsPerReel)
before setResult(grid):
const spinPromise = reelSet.spin();
reelSet.setShape([7, 4, 6, 7, 6, 3]); // any per-reel count in [min, max]
reelSet.setResult(serverGrid); // grid[c].length === shape[c]
await spinPromise;The engine’s AdjustPhase runs between SPIN and STOP and tweens each
reel’s cell height to reelPixelHeight / rowsPerReel[i] while pinned
overlays migrate to their new rows. Cell border stays still during the
win animation thanks to the glyph-only playWin on CardSymbol.
Ways evaluation
Walk reels left-to-right counting reels (not cells) that contain the
kind (or wild). The chain breaks at the first reel with zero matches.
Chains of 3+ reels pay PAYS[kind] * chain * (count_per_reel product):
let ways = 1;
for (let i = 0; i < chain; i++) ways *= cellsByReel[i].length;
const amount = PAYS[kind] * chain * ways;The displayed WAYS headline above the canvas is the product of every
reel’s row count, not the chain - that’s the slot’s bandwidth this
spin, regardless of whether anyone won.
Round flow
roundBus.emit('round:reset')- WinBox to 0, WAYS cleared.- Roll a per-reel shape biased toward the high end of [2, 7].
reelSet.spin()->setShape(shape)->setResult(grid).- WAYS counter:
shape.reduce((p, n) => p * n, 1). - Walk ways evaluation, sort by amount desc, present via
WinPresenter. roundBus.emit('win:set', total).