It includes puzzles involving arithmetic, algebra, geometry, statistics and probability, and so on. This is an Internet contest hosted by the University of Idaho, Department of Mathematics. New puzzles are posted during the school year. Archives available year round. Any student up to grade 12 is eligible to participate.
Winners receive a t-shirt.
Solutions to previous puzzles are posted. The challenges usually involve algebra and geometry. Most of the ones in the archives can be solved by pre-algebra students, though some are definitely harder than others. The graphics and animation are well done, and the challenges are presented in a format that most kids will find enjoyable. Many of the puzzles involve a dead person and a closed room.