Anticipation & slam-stop

Anticipation

ReelSet.setAnticipation([4]) tells reel 5 to enter an ANTICIPATION phase before STOP. Use it when the grid so far could still become a big win.

const promise = reelSet.spin();
setTimeout(() => {
  const scatters = countScattersSoFar(response.symbols.slice(0, 3));
  if (scatters === 2) reelSet.setAnticipation([3, 4]);
  reelSet.setResult(response.symbols);
}, 200);

Slam-stop (skip)

ReelSet.skip() force-lands every reel immediately, using the target from setResult() if one was set. The returned SpinResult has wasSkipped: true.

spinButton.addEventListener('click', () => {
  if (reelSet.isSpinning) reelSet.skip();
  else reelSet.spin();
});

Cheats on this page

• Force anticipation on reels 4+5 (default on) — every spin slow-holds the last two reels.
• Near-miss — 2 scatters visible, reel 5 blanks, anticipation still fires.
• Full 3-scatter trigger — the anticipation pays off.

Test

engine.register({ id: 'a', label: 'a', enabled: true, cheat: forceAnticipation([3, 4]) });
const r = engine.next();
expect(r.anticipationReels).toEqual([3, 4]);