## KenKen

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KenKen is a puzzle whose solution requires a combination of logic
and simple arithmetic and combinatorial skills. The puzzles range
in difficulty from very simple to incredibly difficult. Students
who get hooked on the puzzle will find themselves practicing
addition, subtraction, multiplication and division facts. This
paper is divided into three main sections. The first section is a
sequence of one-step problems. We attempt here to include most of
the common ideas used in solving KenKen puzzles. The second
section solves a $6\times 6$ KenKen step by step, and includes
some mathematical notation that is needed only for problems that
are much harder than these, but nevertheless, may lay a foundation
for a formal approach to puzzles of this type. The final section
consists of Prize Problems.