Marble-Weighing Problem - Flash Version

Here's a free flash version of the popular Mensa-level brain teaser. You have 12 coins. They all weigh the same, except one. You don't know if that one is heavier or lighter. You have a balance scale. You can perform up to a maximum of three weighings to find out which coin has the different weight, and if it is heavier or lighter than the others.

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