February Challenge 2015
Chef and Strange Formula, Chef and Chain, Chef and Equality, Let us play with rank list
April Challenge 2015
Count Sequences, Chef and Interview, Broken Telephone, Chef and Piano Scales
August Challenge 2015
Way Out, Gravity Guy, Cooking Machine, Aditi and Magic Trick
February Challenge 2016
Chef and Strange Operations, Devu and a light discussion, Chef-Detective
April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
September Challenge 2016
Chef and calculation, JosephLand, Chef and digits of a number, Dividing Machine, Chef and Friends, Faded Palindromes
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums
October Challenge 2017
Max Mex, A Balanced Contest, Counter Test For CHEFSUM, Chef and Cycled Cycles, Chef and a great voluntary Program, Chef and Magic Arrays
March Challenge 2018 DIV 1
Chef and Easy Problem, Chef and Gcd Queries, Mix the Colors, Minions and Voting
March Cook-off 2018 Division 1
Chef Goes to the Cinema, Chef Restores a Matrix
November Challenge 2018 Division 1
Appy Loves One, Good Median, Magician versus Chef 2
India