Crossum
v0.11 • Jul 2025







Crossum
Rules
  • Normal sudoku rules apply.
  • A label N↓S indicates N cells of sum S downwards (or N→S rightwards).
Controls
Alt
+
Arrow key
to navigate,
1
…
9
etc. to edit pencil marks,
Esc
to show/hide this info box.
Left click or Tap
to select cell.