The following are a number of puzzles

presented for your entertainment. Feel free to submit any puzzles that you think are interesting, my email address can be found here. If appropriate I will include them here. The main requirement for any puzzles listed here is they should not require any advanced mathematical skills. If you find yourself writing equations for any of the puzzles you are probably approaching it the wrong way. (There are only a couple of exceptions below) The puzzles below are approximately in order of increased difficulty although it is only my own personal impression. To answer your next question, no, answers are not provided to most of the problems. The whole point of a good puzzle is for it to prey on your mind until you solve it. If you are REALLY desperate I will reveal answers if you beg or for a small inducement (eg: beer, chocolates, postcard).

Not so hard	Not easy	Harder
House expansion 2 Buckets 1 1 9 9 Numbers 6 Oranges and 6 Boys Frog down a well How many pigs Trace the envelope Wasted trip Next letter 6 Toothpicks Picking Apples Separate cans Crossing the River Displacement L of a house Mystery Suicide Castle Form a square Labels Circles Odd one out Birth control Expression Slice the cheese Fishing Rearranging 4 coins Splitting horses Elevator Forest Explorer 3 Switches Shifting sticks Swimming fish	Burning fuses Join the dots Missing Square Wedge paradox Join the boxes Divide the doorstop Four men crossing a bridge Slice the T Sequence Black and white hats Black and white hats, version 2 Black and white hats, version 3 Four hats Bear hunting Proof that 2 = 1 Square root Hourglass timing Poison wine 4 Parts Bucket of Rocks Sweets 5 lines of 4 coins Truth/Lie Special number Trace the loops Shifting glasses Four trees Counterfeit Coin Missing Money Sum of cubes Guess my birthday Lockers Bee and the Locomotive Sharing bread	5 coins, 5 moves Torus cuts Symbols How many triangles Goblin Walking distance Cutting a cube Counterfeit Coins Make 100 Zeros Floating balloon Was it a cat Times 4 Carpet redesign How Many Coconuts? Game show door Shaking hands Greek Cross Six Matches Cut the moon Napkins Weighing in a vacuum Four Fours 100 Ladder problem Wind and sound Tides Who wins Cabling Three Disks Three Chords Wild Infinity Why are plants green? Goodstein's theorem

For more information on the counterfeit coin problem see this contribution by Juan Domínguez Montes.

"I can't understand why people are frightened of new ideas, I'm frightened of the old ones"
John Cage

Slicing a torus How many ways can a torus be cut (with a single plane) so that the resulting cross sections are perfect circles?

Fitting puzzle The ribbed sphere Do plans and elevations describe unique geometry? Fun calculus How's your high school calculus? A bucket that holds paint but can't be painted!

A computer once beat me at chess, ubt it was no match for me at Kick Boxing.
Emo Philips

Minus One poem Limeric math Common misconception regarding a cube Most people are poor at visualising even the simplest geometry. Designing the golf ball pyramid puzzle