I've decided to start a nice little collection of puzzles, paradoxes, and problems. I love puzzles and frequently run across ones that pique my interest, so now I have a place to collect them. Most of these I did not make up myself. You may have encountered some of them before. I'll only put puzzles here if I find them sufficiently interesting. You will not find any puzzles here that involve cheap tricks or plays on words, because I hate those. You will also not find any word, letter, or language based puzzles (like crossword puzzles), because I hate those too.

If you like these puzzles, I recommend you check out IBM Research's "Ponder This" monthly puzzle collection. I've found those puzzles to be of high quality and very interesting. CMU's puzzle series is another excellent source.

If you know of any puzzles you think I might like, let me know.