Be the first to solve a problem
Awarded to Tobias Schäfer on 02 Aug 2013
Solve all the problems in Tiles Challenge
Awarded to Tobias Schäfer on 31 Jul 2013
Comment on a problem or solution
Awarded to Tobias Schäfer on 26 Jul 2013
Like a problem or solution
Awarded to Tobias Schäfer on 26 Jul 2013
Solve a problem with a best solution
Awarded to Tobias Schäfer on 18 Jul 2013
Solve a problem for the first time
Awarded to Tobias Schäfer on 15 Jul 2013
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