September Challenge 2018 Division 2
Chef and Adventures, Magician versus Chef
December Challenge 2018 Division 2
Chef and Interactive XOR, Chef and Meatballs, Chef and Interactive Contests, Chef and An Ideal Problem, Max and Electrical Panel
November Challenge 2018 Division 2
Chef and Ridges, Chef and Difficult Contests
October Challenge 2018 Division 2
Chef and Serves, Byte to Bit
January Challenge 2019 Division 2
Yet Another Problem About Sequences, Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, (Challenge) Chef and Matching Game, A Pizza Slice
February Challenge 2019 Division 1
Art of Balance, Chef and Secret Ingredients, Manhattan Rectangle, Guess It Right
July Challenge 2019 Division 2
Guess the Prime!, Parity Again, Minimum and Maximum, Chef and Mean
August Challenge 2019 Division 1
Guddu and his Mother, Dilemma, Maximize an Expression
January Challenge 2020 Division 2
Equality, (Challenge) Building Anthills, Breaking Bricks, English, Chefina and Prefix Suffix Sums, Doraemon, Chef and Dynamo
February Challenge 2020 Division 1
Chef and Railway Stations, No Change Required, (Challenge) Raisins, Long Contest and Cook Off Overlaps
November Cook-Off 2020 Division 1
Flip the String, Chef and IPC Certificates, Hiring Workers
India