February Challenge 2015
Let us play with rank list, Chef and Chain, Chef and Equality
March Challenge 2015
Chef and Notebooks, Devu and his Class, Sign Wave
April Challenge 2015
Chef and Interview, Broken Telephone, Chef and Piano Scales
May Challenge 2015
Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe
June Challenge 2015
Chef and Memory Limit, Chef and Polygons
July Challenge 2015
Bread, Na2a and lucky stone, Chef and Cube
August Challenge 2015
Way Out, Gravity Guy, Cooking Machine, Aditi and Magic Trick
September Challenge 2015
Cracking the Code, Lighthouses, Bank robbery, Nikitosh and xor, Chain of Doughnuts, Count Steps in Matrix
May Cook-Off 2015
Devu and friendship testing
October Cook-Off 2015
Word Stem, Almost Sorted Permutation
September Lunchtime 2015
Sum of palindromic numbers
June Challenge 2016
Chef And The Hiring Event, Chef and Coins Game, Devu and an Array
October Cook-Off 2016
Watson asks Does Permutation Exist, ChefWatson uses Social Network
October Challenge 2017
Chef and a great voluntary Program, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
September Cook-Off 2017
Statistics Construction, Subsequence Equality
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
September Lunchtime 2017
Chef and Cook-Off Contests
India