Reorder digits using rings in order to get them into numerical sequence. That’s what PiChain puzzle is for. Free variant of the game consist of 7 levels (21 levels in the full version) with gradually increasing complexity. First level could be completed in a simple 3 step way. Last level will demand your maximum attention, analytical skills and patience. Game is operated via simple scroll wheel interface where digits are interconnected with one or several circles, which can rotate clockwise and counterclockwise. Scrolling a wheel will change numerical order of interconnected digits (touching the circle will show which digits are connected with it). If level seems too hard you can simply touch a number above the circles and it'll give you a prompt. All levels are available right away so you can choose to start at any level you like but we recommend to move through levels gradually.