Simply select any blank cell and fill in the correct numbers through the intuitive keyboard interface. The game adopts an intelligent color coding system for easy recognition: permanent level numbers are displayed in black as a fixed reference, while all your custom items are illuminated in blue for clear progress tracking.
Gentle error feedback ensures a frustration free experience. Wrong answers will trigger a soft pink cell reminder, giving you the opportunity to rethink and adjust freely. Play at your own pace, pause and resume at any time.