Each puzzle consists of a group of circles arranged in a square grid and containing given clues in various places. The object is to fill all empty circles so that the numbers 1 to 5 for 5x5 puzzles and 1 to 6 for 6x6 puzzles appear exactly once in each row, column and chain. There is only one unique solution for each puzzle.

Game Instructions: Click mouse on the desired circle to open dial pad and then click on the desired number. To remove a number, repeat the above using X at the bottom of the dial pad. Numbers can also be placed by pointing mouse on the desired circle and then typing with the keyboard.