Pick your difficulty.
Same idea, five ways to attack it🔒 Archive · Unlocks at 2,500 fuel cells
Every past Killer Sudoku edition →
Earn fuel cells by solving puzzles across the site. The archive opens at 2,500 lifetime cells and stays open forever.
0
2,500 to go
How it works.
- Each row, column, and 3×3 box uses the digits 1–9 exactly once — same as classic sudoku.
- The grid is divided into cages outlined by thicker borders. Every cage has a small target sum in its top-left corner.
- The digits inside a cage must add up to that sum, and no digit can repeat within a cage.
- There are no starting digits. The cage sums give you everything you need.
A new Killer Sudoku set is published every day at midnight Pacific — five tiers, all sharing the date. Your progress saves to whichever tier you’re solving, on the device you’re on.