The 12 Balls Puzzle

This is a Flash representation of famous lateral thinking puzzle that I created back in 2006.
The puzzle is this:

"You have 12 balls. The all weigh the same, except for one that weighs either more or less than the rest.
Using a set of scales only three times, you have to work out which ball is different to the rest, and also whether it is heavier or lighter than the rest."

This is quite a hard puzzle, but is possible. Simply drag and drop the balls you want to weigh and press the button each time you want to take a reading.

Have fun.

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