Null Set, The
Puzzles collected by Guy Kindler, most requiring some undergraduate mathematical knowledge. Some hints are provided.
Purdue University Problem of the Week
Challenging puzzles, some requiring undergraduate mathematical knowledge. Full solutions are provided several weeks after each problem is set.
Wu's Puzzles
A collection of riddles, puzzles, and technical interview questions, with a discussion forum.
Nick's Mathematical Puzzles
A collection of puzzles, with hints, solutions, and links to relevant mathematical topics.
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