Problems Puzzles and Games
Directory: Science » Mathematics » Problems Puzzles and Games

• wu:riddles
  hardcore tech-interview style riddles and mathematical puzzles. daily high-quality forum discussions More Info....
  http://www.ocf.berkeley.edu/~wwu/riddles/intro.shtml

• Nick's Mathematical Puzzles
  Mathematical puzzles, with hints, full solutions, and links to related math topics. Fun, with an educational element. More Info....
  http://www.qbyte.org/puzzles/