March Challenge 2013
Random decreasing function, Minesweeper, Fire Escape Routes, Tourist Translations, Approximately
April Challenge 2013
Little Elephant and Music, Barcelona Gameplay Tactics, ChefGame, Kingdom Unity, Fault Tolerance, Maximum Weight Difference, Levy Conjecture
May Challenge 2013
Matchsticks, Field Trip, Your Name is Mine, Name Reduction, Password Cracking Challenge, Witua and Math
June Challenge 2013
Lapindromes, W String, To challenge or not, Predictopus, Dessert Wizard, Just Some Permutations 3, Collecting Magical Berries, Little Elephant and Mouses, Two k-Convex Polygons
August Challenge 2013
Little Elephant and Lemonade, Splitting Candies
October Cook-Off 2013
Polo the Penguin and the Test
October Challenge 2013
Yet Another Nice Girl, Kamehameha, Edit Distance on Grid, CAO Stage-3, Sereja and Transformation, Maxim and Dividers, Helping Lira, Little Elephant and Bamboo
November Challenge 2013
Chef Game, Superpowers of 2, Yet Another Cute Girl, Uncle Johny, Square Digit Squares, Missing some chairs
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
United States