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Challenge Difficulty Levels

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I have enjoyed reading Jonathan and Richard's posts summarizing a few of the FLL challenges. Specifically, I like that they are providing "Speculated Difficulty Levels". Here are some questions that might be fun for us to discuss:

What defines an easy challenge?

What factors combine to create a difficult challenge?

If you were designing the 2008 FLL Challenge, what types of missions would you add to challenge teams?

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