Old Brain Teasers

Forums

1. Puzzles and Riddles (section closed)

   • Logic Puzzles
   • Logic Problems
   • Water and Weighing Puzzles
   • Einstein's Riddles
   • Number Puzzles
   • River Crossing Puzzles
   • Puzzle Championship Teasers
   • Geometry/Dissection Puzzles
   • Matchstick Puzzles
   • Cryptograms and Algebra Puzzles

   My favorite puzzles sorted in several subforums.

   7k

   posts

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   • Cryptogram
   • By Skilledcjb, December 11, 2019
2. Paradoxes

   The most famous paradoxes - liar paradox, barber paradox, doubtful existence of God, sentences from life, and sophisms.

   2.1k

   posts

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   • Think about these
   • By SharkyB, January 14
3. Brain Games and Others

   Hints and help from other visitors.

   129

   posts

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   • Survey for New Online Sudoku Game
   • By Shreyas, June 26, 2023