November Challenge 2014
Distinct Characters Subsequence
February Challenge 2015
Chef and Chain, Let us play with rank list, Chef and Equality
April Challenge 2015
Count Sequences, Chef and Interview, Broken Telephone, Division of Lands, Chef and Piano Scales
May Challenge 2015
Chef and Prime Divisors, Set Difference , Chef and new recipe
June Challenge 2015
Chef and Memory Limit, Chef and Polygons, Chef and His Friend
July Challenge 2015
Na2a and lucky stone, Chef and Cube
August Challenge 2015
Way Out, Gravity Guy, Cooking Machine, Aditi and Magic Trick
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix, Bank robbery, Cracking the Code
October Challenge 2015
Time measure, Rupsa and Equilateral Triangle, Count Subarrays, Who dares to be a millionaire
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Pairwise union of sets
August Long Challenge 2017
Palindromic Game, Greedy Candidates, Chef and Mover, Chef and Rainbow Array
August Cook-Off 2017
Real obtuse, From heaven to earth
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, Partition the numbers
March Lunchtime 2018 Division 2 (Unrated)
Chef and Friends, Magic Elements
September Challenge 2018 Division 2
Magician versus Chef, Chef and Adventures
India