October Challenge 2014
Chef and Ground, Magical Girl and Colored Liquid Potions
November Challenge 2014
Distinct Characters Subsequence, Let us construct palindrome
February Challenge 2015
Let us play with rank list, Chef and Equality, Chef and Chain
April Challenge 2015
Count Sequences, Chef and Interview, Broken Telephone, Chef and Piano Scales
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix, Nikitosh and xor
October Challenge 2015
Time measure, Count Subarrays, Who dares to be a millionaire, Spheres, Rupsa and Equilateral Triangle
December Challenge 2015
Oracle Devu and Longest Common Subsequence, Plane Division, Chef and the stones
April Cook-Off 2015
Equality, Version Control System
August Cook-Off 2015
Chef and the XORed Number , Chef and the Wildcard Matching
United States