Daily Killer Sudoku

How to play Killer Sudoku

Killer Sudoku is Sudoku with the givens removed. Instead of pre-filled numbers, the grid is divided into dotted cages — each cage shows a target sum in its top-left corner. Fill every cell with a digit from 1 to 9 so the standard Sudoku rules hold AND every cage adds up to its target. No digit may repeat within a cage.

THE RULES

1. Every row must contain each digit 1–9 exactly once.
2. Every column must contain each digit 1–9 exactly once.
3. Every 3×3 box must contain each digit 1–9 exactly once.
4. The digits in each cage must sum to that cage's clue. No digit repeats inside a cage.

BEGINNER STRATEGY

• Start with the smallest cages. A 2-cell cage summing to 3 can only be {1, 2} — and a cage summing to 17 can only be {8, 9}. These "locked" cages hand you digits for free.
• Use the 45 rule. Any complete row, column, or 3×3 box sums to 45. If cages inside a region are fully contained, their totals must add to 45 — meaning any cage that straddles the region boundary lets you calculate the "outie" digit exactly.
• Eliminate with Sudoku rules. Once a cage's possible digit sets are narrowed down, treat them like naked or hidden candidates — the same row/column/box logic from regular Sudoku still applies.
• Never repeat in a cage. Even if a digit is legal in a cell by Sudoku rules, drop it as a candidate if it already appears elsewhere in the same cage.

ABOUT THIS DAILY

Every visitor on the same UTC day sees the same cage layout, seeded from the date. Your progress is saved to this browser — close the tab and come back later. A new puzzle unlocks at midnight UTC. If you enjoy the puzzle, GridJoy on Google Play has 17 more puzzle types (Sudoku, Kakuro, Calcudoku, and more) plus a ghost companion that grows with you as you solve.