Fill in the empty squares with numbers 1 to 9. The same number must not be entered twice in each column vertically or horizontally. The same number must not be placed twice within the 3x3 frame surrounded by thick lines. When you press the end button, it will judge whether it is correct or incorrect. Playable on PC, Smartphone etc.
Score = Level * 15000 + Time * 10
There are 35 confirmed squares at level 1, and the number decreases by 5 each time the level increases.