August Challenge 2018 Division 2
Problem Sort, Sheokand and Number, Spell Bob, Modular GCD
September Challenge 2018 Division 2
Magician versus Chef, War of XORs, Chef and Adventures
November Challenge 2018 Division 2
Chef and Difficult Contests, Chef and Happiness, Good Median, Chef and Ridges
October Challenge 2018 Division 2
Appy and Balloons , Chef and Serves, Byte to Bit
January Challenge 2019 Division 2
(Challenge) Chef and Matching Game, A Pizza Slice, Fancy Quotes, Chef and Modulo Game, Lucky Number Game, Different Neighbours, Yet Another Problem About Sequences, Distinct Pairs
February Challenge 2019 Division 1
Chef and Magical Jars, Appy and Contest
June Challenge 2019 Division 1
Chef and Ingredients, Sum and GCD, (Challenge) SnackDown 99
July Challenge 2019 Division 1
Guess the Prime!, Circular Merging
September Challenge 2019 Division 2
Chef and Good Subsequences, Easy Fibonacci, Chef Designed a Network, Chef and Interesting Subsequences
January Challenge 2020 Division 2
Chef and Dynamo, Doraemon, Breaking Bricks
March Challenge 2020 Division 2
XOR Engine, Ada Bishop 2, Pintu and Fruits
India