One fire button, two jobs: press it with an empty tray to buy 10 玉 (tama, "balls") for a flat price - well under a coin, so even a 1-coin balance can buy in - then keep pressing to release them one at a time, real pachinko-parlor style, at your own pace. Every ball bounces independently through the peg field and settles into a prize slot (0-0.35 coins). Watch for the glowing ワープ (warp) pins - hit one and your ball teleports to the other with a speed boost. Over a full tray, expect to net roughly 1 coin per minute played - a small, genuine edge in your favor, not a giveaway.