Instructions
The objective is to fill the 9x9 grid with digits so that each of the nine rows, nine columns, and nine boxes (3x3 subgrids) contains all of the digits 1 through 9 exactly once.
A cell in the grid is selected or deselected by tapping on it.
A digit is entered or cleared in a selected cell by toggling the associated key of the keypad. The pencil key can be used to annotate one or more candidates.
Additional features and customizable settings are accessible from the menu.
Settings
Highlight
- Digits
- Highlight cells set to the selected digit.
- Notes
- Highlight the selected digit in notes.
- Conflicts
- Highlight cells in conflict with the selected digit.
- Errors
- Highlight all errors.
Notes
- Compute on New
- Automatically compute notes in new grids.
- Auto-Clear
- When a digit is entered, clear it from notes in the associated row, column, and box.
- Sticky Note Key
- Stay in note mode when selecting an empty cell.
- Preserve on Clear
- Do not erase notes on deselecting a cell's note key.
- Promote on Clear
- Promote single note to a digit on deselecting the note key.
- Double-Tap Promote
- Double tap a single note to promote it to digit.
Display
- Timer
- Show the timer.
- Key Dots
- In each key, show which boxes the digit is set in.
- Bold Digits
- Draw digits with a bold font.
- Landscape Invert
- Swap the grid and keypad in landscape orientation.
- Full Screen
- Show the grid and keypad in full screen.
Control
- Grid Hovering
- Allow moving around the grid when selecting a cell.
- Number then Cell
- Select a key while no cell is selected to toggle digit in subsequently tapped cells.
Theme
- Aqua
- Classic
- Khaki
- Retro
- Night