This is a puzzle of Sudoku family. The purpose is to place numbers (digits) from 1 up to 7 in each field, so that every ring and every petal (directed clockwise or counter clockwise) contains each one of the digits without repetitions. Some fields are preset and cannot be modified. A puzzle is guaranteed to have a single solution.

The application allows 5 levels go difficulty. It offers convenient features helping to solve a puzzle. It is also possible to enter your own puzzle and watch how the computer solves it.