September Challenge 2018 Division 2
War of XORs, Chef and Adventures, Magician versus Chef
October Challenge 2018 Division 2
Chef and Serves, Byte to Bit
February Challenge 2019 Division 2
Chef and Secret Ingredients, Appy and Contest, Deputy Chef
March Challenge 2019 Division 2
Chef got Recipes, Chef and Number Game, Chef and a Beautiful Digit
March Challenge 2020 Division 2
XOR Engine, Pintu and Fruits, Ada Bishop 2
April Challenge 2020 Division 2
Strange Number, Unit GCD, Sell All the Cars, COVID Pandemic and Long Queue
May Challenge 2020 Division 2
Coronavirus Spread, Isolation Centers
December Challenge 2020 Division 2
Even Pair Sum, Vaccine Production, Vaccine Distribution
Costa Rica