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Controls
- 1–9
- Enter in the current mode
- Z X C V
- Normal, corner, center, color. Space cycles.
- Shift + digit
- Corner mark
- Ctrl/⌘ + digit
- Center mark
- Ctrl+Shift + digit
- Color
- Arrows
- Move. Shift/Ctrl + arrows extends the selection.
- Backspace
- Clears digits first, then marks, then colors
- Ctrl+A / Shift+A / I
- Select all / none / invert
- PgUp PgDn
- Previous / next mode (Y works as Z on German keyboards)
- F
- Full screen, where the browser allows it
- `
- Toggle letter entry (A–Z) for variables. Works in digit, corner and center modes. Esc returns to digits.
- Ctrl+Z / Y
- Undo / redo
- H · P · Esc
- Hint · pause · deselect
- Double-click
- Select every matching digit (or a whole cage)
- Paste
- Paste any puzzle string or f-puzzles link to load it