Retro Cat Senior Retro Guru Jan 8, 2014 #1 http://projecteuler.net/problems Some of these are dead hard!
02gf74 Old School Grand Master Feedback View Jan 9, 2014 #2 not really puzzles per se, but mathematical problems that have no real use, not for me anyway. try this: http://www.fantasticcontraption.net/ a puzzle based on physics, no use in the real world other than it is more fun than your mathematical 'puzzles'. note that there is a solution to each of the puzzles that do not use any powered wheels, just gravity.
not really puzzles per se, but mathematical problems that have no real use, not for me anyway. try this: http://www.fantasticcontraption.net/ a puzzle based on physics, no use in the real world other than it is more fun than your mathematical 'puzzles'. note that there is a solution to each of the puzzles that do not use any powered wheels, just gravity.