Caged Numerals
Fill each row, column and 2×2 box with 1–4. Cages must match their sum with no repeated digit. Select a cell, then a digit. Check validates all constraints.
How to play & source
Fill each row, column and 2×2 box with 1–4. Cages must match their sum with no repeated digit. Select a cell, then a digit. Check validates all constraints.
Touch the tiles and controls. Keyboard: Tab, Enter or Space activate any button; arrows move in movement games. R restarts; Z undoes calm puzzles. Cell numbers are shown in each tile’s upper-left corner.
Mechanic research: Sudoku Killer / 杀手数独Original small-board interpretation, not an official port. Original code, names, layouts and CSS-drawn tiles. No external assets, trackers or network requests.
New tactical layer
Difference cages replace sums with largest-minus-smallest constraints while retaining row, column, box and no-repeat rules. Cages are drawn directly on the board with their targets.