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Earned on 27 Jun 2012 for first solving Problem 796. Removing rows from a matrix is easy - but what ....
Solve all the problems in CUP Challenge problem group.
Must have 50 solvers for a problem you created.
Solve all the problems in Tiles Challenge problem group.
Solve all the problems in ASEE Challenge problem group.
Create 10 problems.
Solve 500 problems.
Must receive 25 total likes for the problems you created.
Earned on 13 Sep 2013 for receiving 50 total likes for solutions.
Must receive 10 likes for a problem you created.
Solve all the problems in Magic Numbers problem group.