February 2013 Challenge
Buy1-Get1, Climbing Stairs, Efficient Painting, Little Elephant and Cards
March Challenge 2013
Random decreasing function, Tourist Translations, Approximately, Fire Escape Routes, Minesweeper
April Challenge 2013
Levy Conjecture, Cylinder, Maximum Weight Difference, Kingdom Unity, Barcelona Gameplay Tactics, Little Elephant and Music, Fault Tolerance
May Challenge 2013
Juno Puzzle for May, Field Trip, Your Name is Mine, Name Reduction, Password Cracking Challenge, Tree Counting, Witua and Math, Matchsticks
June Challenge 2013
Dessert Wizard, Predictopus, W String, Lapindromes
