Killer Sudoku!

Killer Sudoku! brings the killer sudoku experience to your Chrome browser with a clean, responsive interface. Solve by filling the grid under classic Sudoku rules, while every outlined region must sum to a target value. The puzzle starts blank, but robust note and planning tools help you track possibilities right on screen.

Key features include dual keypads for fast entry, multi-square note entry, reusable combination lists, quick sums, drag-to-list, an in-app calculator, undo/redo, mistake highlighting, auto note cleanup, and two color schemes. It ships with 10 free puzzles and over 3,000 puzzles available for purchase, all with unique solutions.