- 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.
- Kakuro-san
- Presents daily Kakuro puzzles and archives previous game problems.
- 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.
- 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.
- 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.
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