March Challenge 2013
Approximately, Minesweeper, Tourist Translations
April Challenge 2013
Little Elephant and Music, Barcelona Gameplay Tactics, Kingdom Unity, Fault Tolerance, Maximum Weight Difference, Levy Conjecture
May Challenge 2013
Password Cracking Challenge, Your Name is Mine, Name Reduction, Witua and Math
June Challenge 2013
Predictopus, To challenge or not, Lapindromes
July Challenge 2013
Chef and Walking on the rectangle
August Challenge 2013
Little Elephant and Lemonade, Hello Hello, Splitting Candies
United States