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Press play to open a new Extreme Killer Sudoku puzzle.
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Start with the Academy guide if you want a structured explanation of how Killer Sudoku works.
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Killer Sudoku adds arithmetic constraints on top of standard grid logic. You are not only placing digits correctly, but also making sure cage totals work.
Avoid solving cages in isolation. A cage total may look valid by itself, but the digits still need to fit the rest of the Sudoku grid.
Killer Sudoku adds cages with target sums to the normal Sudoku rules. Each cage must reach its total while the digits still obey the usual row, column and box restrictions.
Start with small cages, common sum combinations and normal row, column and box logic. The goal is to learn how arithmetic clues and standard Sudoku restrictions work together.
Start with cages that have very limited combinations, then compare those possibilities with the surrounding rows, columns and boxes.