July Challenge 2013
Chef and Walking on the rectangle
December Challenge 2013
Chef and Codes, Funny Marbles, Magic Pairs, Rectangular Queries
January Challenge 2014
Please like me, Chef and Feedback
August Challenge 2014
The Leaking Robot, Chef and Gift
October Challenge 2014
Chef and Ground, Magical Girl and Colored Liquid Potions
December Challenge 2014
Chef and Apple Trees, Kali and Devtas, Alok-nath and His Sanskars, XOR with Subset
January Challenge 2015
Sereja and Number Division 2, Chef and A Large Permutation, Chef and Stones, Sereja and Votes, Gcd Queries
February Challenge 2015
Let us play with rank list, Chef and Equality, Chef and Chain
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
May Cook-Off 2015
Devu and friendship testing
India