Mathematical Brain Teasers

• CellFighter  - Provides a description, shows resources, and gives player guides of the extension module.
• IBM Research: Ponder This  - Explores the logical and mathematical problems posed by the IBM research team. Details solutions.
• Jim Loy's Puzzle Page  - Presents details on the different number, geometric, logic, word, probability puzzles.
• K-12 Math Puzzles  - Compilation of math puzzles and brain teasers including site visitor submissions.
• Kakuro-san  - Presents daily Kakuro puzzles and archives previous game problems.
• KenKen  - Puzzles that make you smarter. Mathematical puzzles created by the Kenerator, that are then assessed for difficulty and marked easy or medium. Find rules, tutorials, and solving tips.
• Leisure Ideas: Puzzles  - Collates and presents a list of mathematical puzzles with hints and solutions.
• Mathematical Jigsaw Puzzles  - Discusses the history and rules on the various polyominos and square puzzles.
• Mathproblems.info  - Features a searchable collection of math problems with respective difficulty ratings.
• Monty Hall Game  - Provides an interactive demonstration on the empirical effects of statistics.
• The Monty Hall Problem  - Presents the theories of probability on the puzzles and explains solutions.
• Numbrosia  - Strategic puzzle is fun for those who love Sudoku and Rubik's Cube.
• Perplexus  - Compiles a collection of logic problems, mathematical puzzles, and scientific games.
• The Puzzles of Oscar  - Contains mathematical and scientific puzzles and problems with an explanation on the solutions.
• Quick Logic Puzzles  - Explains the mission of the organization, presents the club's puzzles and problems, and gives relevant links.
• TechInterview  - Gives answers to technical questions, programming problems, and brain teasers.
• The Truth Tree's Math and Logic Board  - Presents an archive of mathematics and logic problems arranged by difficulty level.
• Two Envelope Paradox  - Discusses the solution of the paradox and gives highlights of the probabilities.