Sudokupencil-mark edition

Sudoku · Kakuro · Slitherlink

Difficulty profile

Step-by-step solving sequence

Save points — none yet

Solved!

Hover an empty cell to see every digit with no immediate conflict. Click a digit to place it · Ctrl/⌘-click to strike it from the options (Ctrl/⌘-click again to restore) · click a placed digit to clear it. You can also type 1–9 over a hovered cell, or Backspace to clear. The difficulty profile is computed in C++/WebAssembly: it repeatedly applies the easiest human technique that makes progress, so the hardest tier reached and the total step count preview the solving experience.