You have 12 marbles. They are identical in size and shape. One of the marbles is of a different weight than the other 11, either lighter or heavier. Using a simple scale ONLY THREE TIMES and with only these marbles, isolate the unique marble AND determine whether it is light or heavy.
I wrote out my answer and I will post it tomorrow! It's a time-eater, I warn you! Probably the most fun logic riddle I've ever seen. I'm very proud of myself for figuring out the answer.
A Tip: After developing a strategy, go through it step by step, on paper, to double check and triple check your strategy. Expect several dead ends.
Here's the answer post on my blog.
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