September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
Max Mex, Counter Test For CHEFSUM, A Balanced Contest
November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
January Challenge 2019 Division 2
A Pizza Slice, Fancy Quotes, Chef and Modulo Game, Lucky Number Game, Different Neighbours, Distinct Pairs
February Challenge 2019 Division 2
Deputy Chef, Art of Balance, Appy and Contest, Chef and Secret Ingredients, Chef and Magical Jars, Guess It Right, Manhattan Rectangle
March Challenge 2019 Division 2
Chef got Recipes, Chef and Number Game, Chef and a Beautiful Digit
June Challenge 2019 Division 2
Road Signs, Chef and Proxy, Lent Money, Guddu on a Date, Chef and Ingredients, Sum and GCD
India