March Challenge 2013
Peaceful Calculator, Little Elephant and Colored Coins, Minesweeper, Fire Escape Routes, Approximately, Longest Article, Tourist Translations, Random decreasing function, Festivals
April Challenge 2013
Little Elephant and Music, Barcelona Gameplay Tactics, ChefGame, Kingdom Unity, Maximum Weight Difference, Levy Conjecture, Cylinder
July Challenge 2013
Mountain Holidays, Circle of death, Count K-Primes, Chef and Walking on the rectangle , The Probability Of Winning, Galactik Football
November Challenge 2013
Black and White Tree, Missing some chairs, Square Digit Squares, Uncle Johny, Queries With Points, Gangsters of Treeland, Superpowers of 2, Chef Game, Yet Another Cute Girl
February Challenge 2014
Colored Array, Make It Zero 2, Little Elephant and Subarrays, Longest Common Pattern, Count on a Treap, Graph Challenge, Chef and Favourite Sequence, Make Him Happy, Draughts, Little Elephant and Movies
January Long Challenge 2016
Sereja and Salesman, Chef and Inflation, Rupsa and the Game, Churu and Balls, Asteroids, Cyclist Race, Dai Ma Chu Shi, Chef and Time Machine, Devu and Perfume
November Challenge 2020 Division 1
Restore Sequence, Scalar Product Tree
China