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Iron Balls is a puzzle in the UK version of Professor Layton and the Curious Village.
Here are 12 iron balls on the kind used in school science experiments. They are all the same size and shape. 11 of them weigh 200g while just one weighs 100g.
What is the least number of times you can use the scale shown to find out which of the iron balls is the 100g one?
You don't need to use the scale at all! If one of the iron balls is half the weight of the others, you can tell the difference just by holding them!
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A big thanks to http://professorlaytonwalkthrough.blogspot.com