Free math lessons and math homework help from basic math to algebra, geometry. The classic puzzle, a favorite of programmers and Buddhist monks. Puzzle index for geometry puzzles, logic puzzles, math puzzles, weight puzzles, moves puzzles and puzzles. You can sort the puzzle list by clicking The Little Math Puzzle has been a K-12 Internet activity since 1995 for grades 5-9. Currently the puzzles have ceased but the site maintains complete The puzzle originated with a self-taught maths genius nearly a century ago – the solution may lead to advances in physics and internet security.