October Challenge 2017
Counter Test For CHEFSUM, A Balanced Contest, (Challenge) Connecting computers, Max Mex
December Challenge 2017
Red and blue points, Chef and Hamming Distance of arrays, Penalty Shoot-out, Chef And Easy Xor Queries, Chef And his Cake, Total Diamonds, Chef and Universe
October Lunchtime 2017
Buggy Calculator, Maximum Number
December Challenge 2019 Division 1
(Challenge) Cubical Virus
January Challenge 2020 Division 1
Doofish Matrix, Army of Me, Chefland Army, (Challenge) Building Anthills
Taiwan