Support
Each round gives you a target number and a set of numbered stones. Tap a stone, choose +, −, × or ÷, then tap a second stone: the two stones merge into a new one. Reach the target exactly, or get as close as you can. Long press a merged stone to see how it was made. Hints are unlimited and never cost points.
Classic adapts its difficulty to how you play. Nine Stones uses a three-by-three board. Daily Challenge gives everyone the same puzzle each day. Relax uses large, high-contrast stones with no negative feedback. Memory asks you to recall which stones you combined. Online Duel matches you with another Game Center player on the same stones; the closest result to the target when the clock runs out wins.
Solo modes are untimed by default. In Settings you can turn on a 1, 2, 3 or 5 minute round clock. When time runs out, your closest stone still earns partial credit.
Online Duel needs an internet connection and a Game Center sign-in (Settings › Game Center on your device). Matchmaking waits for another player who is searching at the same time. While you wait, "Practice Against the Computer" gives you the full duel experience offline.
All progress is stored only on your device. Deleting the app removes every statistic, streak and saved puzzle.
Questions, bug reports or ideas: atakan.apaydin@icloud.com. We usually answer within a few days.