The Math Forum Algebra Problem of the Week
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Fitzweb Brainteasers A small collection of puzzles to challenge your mind and fill your copious free time.
Cut the Knot Interactive Mathematics Miscellany and Puzzles
Math Magic Math contest problems on the internet.
High School Problems and Puzzles
dansmath - problem-of-the-week
NRICH | October 2002 | Problems
Ken Duisenberg's Puzzle of the Week
IMO Exam Problems International Mathematics Olympiad
Olympiad Math Madness They claim to have the hardest problems on the web
The problems of the All-Soviet-Union mathematical competitions 1961-1986
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