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Earned on 27 Dec 2012 for commenting on Problem 1140. RMS value from a set of observations.
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Earned on 28 Dec 2012 for first solving Problem 1147. Possible Outcomes of American Roulette.
Solve a problem with a best solution.
Solve all the problems in CUP Challenge problem group.
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Create 10 problems.
Solve 500 problems.
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Must receive 25 total likes for the problems you created.
Must receive 50 total likes for the solutions you submitted.
Must receive 10 likes for a problem you created.