Counterful
v0.11 • Mar 2025





.


Counterful
Rules
  • Normal sudoku rules apply.
  • Cells show how many even·odd consecutive digits they immediately see in all 4 directions combined.
  • If adjacent digits are both low (<5) or both high (>5), they're joined by a diamond.
  • If a digit equals the number of unique (up to 8) neighbouring digits, its cell contains a star.
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.