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Recreational mathematics or puzzles with serious mathematical content. Note that math contest problems are generally considered off-topic.

21 votes
1 answer
817 views

Who wins the Rubik's cube game?

EDIT: It may be simpler to consider the same problem with the 15 puzzle first. …
Christopher King's user avatar
35 votes
2 answers
4k views

Who wins two player sudoku?

Let's say players take turns placing numbers 1-9 on a sudoku board. They must not create an invalid position (meaning that you can not have the same number in within a row, column, or box region). The …
Christopher King's user avatar