1. Each row and column of the KenKen puzzle should be filled in with a number from 1-5 exactly once.
2. The bolded lines break the puzzle into multiple sections of 1-4 cells, with each section containing a target number and mathematical operation in the top left. The numbers in each section must be combined using the given operation to create the target number. For example, in the top left section made up of two cells and given the rule of 5+, the two cells should be added together to get the target number 5, but should not violate the first rule.
3. A number can be used more than once in the same section, as long as the first rule is not violated.

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