DWG-102.2.09
Killer Sudoku #9 · Medium
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About this puzzle
Sheet #9 divides the grid into 25 cages averaging 3.2 cells. One cage has only one possible set of digits — the natural place to begin.
The largest cage covers 5 cells and adds up to 33; it starts at row 9, column 2.
The most open cage, 20 in 4 cells, still allows 12 different sets of digits — leave it for later.
Where to start
The 4 in 2 cells starting at row 7, column 3 can only be 1 + 3.
At least once you will need the rule of 45: total a row, column or box and subtract the cages that lie inside it.