November Challenge 2018 Division 2
Chef and Difficult Contests, Chef and Ridges
January Challenge 2019 Division 2
Yet Another Problem About Sequences, Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, A Pizza Slice
March Challenge 2019 Division 2
Chef and a Beautiful Digit, Chef and Number Game, Chef got Recipes
June Challenge 2019 Division 2
Road Signs, Chef and Proxy, Lent Money, Guddu on a Date, Chef and Ingredients, Sum and GCD
July Challenge 2019 Division 2
Chef and Mean , Minimum and Maximum, Circular Merging, Guess the Prime!, Parity Again
December Lunchtime 2019 Division 2
The Evil Professor, Stupid Machine, Check Algorithm, Guess the number
January Challenge 2020 Division 1
Chefina and Prefix Suffix Sums, (Challenge) Building Anthills, Chefland Army, English, Doofish Matrix, Doraemon, Chef and Dynamo
ENIGMA - PLINTH'20 LNMIIT (Rated for all)
Gru is Handing Out Bananas, Minion AND Range, Recruit Villagers
UWCOI 2020 (Rated for all)
Button Pairs, Base Plans, Find maximum in an Array
India