Fill the grid so that each row, column, and 3×3 box contains the digits 1-9 without repetition.
Controls
Click any cell to select it
Use keyboard (1-9) to place numbers
Press the same number again to remove it
Navigate with arrow keys or WASD
Press Delete, Backspace ot 0 to clear a cell
Press U or Ctrl+Z to undo
Modes
Pencil mode (N): Make small notes in cells instead of placing numbers
Marker mode (M): Highlight cells for analysis. Click to mark/unmark cells. With multicolor enabled: peach → green → clear. Desktop only: drag to mark multiple cells. Double-click button or Shift+M to clear all
Eraser mode (E): Click cells to clear them quickly
Difficulty Levels
Use the dropdown next to "New Game" to select difficulty and duration
Difficulty ranges from Easy to Insane
Duration indicates puzzle length: S (Small), M (Medium), L (Large)
Puzzle Codes
Load puzzles by code or number (e.g., #123 or MS#456)