March Challenge 2013
Approximately, Fire Escape Routes, Tourist Translations
April Challenge 2013
Levy Conjecture, Maximum Weight Difference, Kingdom Unity, ChefGame, Barcelona Gameplay Tactics, Little Elephant and Music
May Challenge 2013
Matchsticks, Witua and Math, Name Reduction, Your Name is Mine, Field Trip
June Challenge 2013
Little Elephant and Mouses, Lapindromes, W String, Predictopus, Dessert Wizard, Just Some Permutations 3
July Challenge 2013
Mountain Holidays, Galactik Football, The Probability Of Winning, Chef and Walking on the rectangle , Count K-Primes, Circle of death
August Challenge 2013
Splitting Candies, Hello Hello, Chef and Segments, Save The Princess, Little Elephant and Lemonade, The Number Of Solutions
September Challenge 2013
Little Elephant and Exams, Cool Guys, Chef and Integers , Project Spoon, CAO Stage-1, CAO Stage-2
October Challenge 2013
Yet Another Nice Girl, Kamehameha, Sereja and Transformation, Maxim and Dividers, Helping Lira, Little Elephant and Bamboo
November Challenge 2013
Superpowers of 2, Yet Another Cute Girl, Uncle Johny, Square Digit Squares, Missing some chairs
November Challenge 2019 Division 2
Hard Sequence, Weapon Value
January Challenge 2020 Division 2
Chef and Dynamo, Doraemon, Breaking Bricks
Australia