July Challenge 2015
Bread, MasterChef, Na2a and lucky stone, Chef and Cube, Rohith and Circles, Addition and Multiplication
September Challenge 2016
Chef and Friends, Dividing Machine, Chef and digits of a number, Faded Palindromes, JosephLand, Chef and calculation
October Challenge 2017
Chef and Magic Arrays, A Balanced Contest, Counter Test For CHEFSUM, Max Mex, Chef and Cycled Cycles, Chef and a great voluntary Program
March Challenge 2018 DIV 1
Chef and Easy Problem, Chef and Gcd Queries, Mix the Colors, Minions and Voting
November Challenge 2018 Division 1
Appy Loves One, Good Median, Magician versus Chef 2
