KLAP!

Choose one part and press Fold!, or pass. Closed catches marbles; open lets them through. With multiple players every distinct fold happens once, then marbles roll. Versus: 24 marbles, at most 12 rounds; highest score wins. Co-op: all marbles in the goal within 20 rounds.

R releases stored marbles. P is the upper passage for newly arriving marbles. Beige and green chutes show both routes. Closed holds marbles. Opening previews only the next R exit.