Killer Hidden cages- Killer lovers will appreciate this feature. An undocumented feature in Logic Wiz app is the ability to define hidden cages, set their sum, and see potential combinations in the
The Basics of Killer Sudoku - by James Sinclair
Killer Aid
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Killer sudoku - Wikipedia
The Basics of Killer Sudoku - by James Sinclair
Killer Sudoku Puzzles Main Page and Killer Sudoku Cheat Sheet