Earned on 13 Apr 2012 for solving Problem 470. Scoring for oriented dominoes.
Like a problem or solution.
Earned on 28 Nov 2012 for commenting on Solution 169456.
Solve a problem first.
Create a problem.
Earned on 12 Mar 2013 for submitting the best solution Solution 146013.
Earned on 29 Aug 2012 for solving all the problems in Tiles Challenge.
Must have 50 solvers for a problem you created.
Solve all the problems in Cody Challenge problem group.
Earned on 18 Dec 2012 for solving all the problems in ASEE Challenge.
Create 10 problems.
Solve 500 problems.
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 solution you submitted.
Must receive 10 likes for a problem you created.