DWG-102.2.04
Killer Sudoku #4 · Medium
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About this puzzle
Sheet #4 divides the grid into 25 cages averaging 3.2 cells. 5 cages have only one possible set of digits — the natural place to begin.
The largest cage covers 5 cells and adds up to 32; it starts at row 7, column 1.
The most open cage, 25 in 5 cells, still allows 12 different sets of digits — leave it for later.
Where to start
The 23 in 3 cells starting at row 4, column 3 can only be 6 + 8 + 9.
The 3 in 2 cells starting at row 1, column 5 can only be 1 + 2.
At least once you will need the rule of 45: total a row, column or box and subtract the cages that lie inside it.