February 2013 Challenge
Climbing Stairs, Buy1-Get1
March Challenge 2013
Tourist Translations, Approximately, Fire Escape Routes, Minesweeper
April Challenge 2013
Little Elephant and Music, Barcelona Gameplay Tactics, Fault Tolerance, Maximum Weight Difference, Levy Conjecture
April Cook-Off 2013
Andrew and the Meatballs, Andrew and the Meatballs again
May Challenge 2013
Password Cracking Challenge, Your Name is Mine, Name Reduction
June Challenge 2013
Predictopus, To challenge or not, Lapindromes
August Challenge 2013
Little Elephant and Lemonade, Hello Hello, Deleting numbers, Splitting Candies
September Challenge 2013
Little Elephant and Exams, CAO Stage-2, CAO Stage-1, Chef and Integers , Cool Guys, Project Spoon
October Cook-Off 2013
Polo the Penguin and the Numbers, Polo the Penguin and the Test
November Challenge 2013
Square Digit Squares, Missing some chairs, Uncle Johny, Sereja and Vectors, Yet Another Cute Girl, Superpowers of 2, Chef Game
December Challenge 2013
Chef and Codes, Funny Marbles, Magic Pairs, Rectangular Queries
June Challenge 2014
Chef and Subarray, Guessing Game
June Challenge 2017
A Good Set, Xenny and Coin Rankings, Triplets
