Difference between revisions of "Cage"
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Latest revision as of 04:57, 31 May 2020
A cage is the basic building-block of a Killer Sudoku puzzle. It is a set of contiguous cells, surrounded by a dotted outline or marked off with distinctive background color. The cage is marked (usually in the top left corner) with a number which represents the sum of all the cells in the cage.
The highlighted part of this grid shows a cage with 4 cells and a sum of 26.
According to the Killer Convention, digits can only appear once in a cage, even if the normal Sudoku rules would allow this.
Through application of the 45 rule, a solver may create additional split cages or hidden cages that subdivide or overlap the original given cages of a puzzle. These cages will only follow the Killer Convention if their cells see each other.
