Play Killer Sudoku with cages, sums, and modern hinting.
Killer Sudoku combines classic Sudoku rules with cage totals. You must place 1 to 9 in each row, column, and 3x3 box, while also matching each cage sum.
The small number in each cage is the target sum for all cells in that cage. Digits cannot repeat inside the same cage.
It is usually harder at first because you solve with both Sudoku elimination and cage arithmetic at the same time. With practice, cage patterns become faster to read.
Start with cages that have very limited combinations, then use row and column restrictions to eliminate options. Keep notes tidy and update them after each confirmed digit.
Yes. Archived Killer daily puzzles are available by date, so you can replay earlier grids and compare improvement over time.