March Challenge 2020 Division 2
XOR Engine, Ada Bishop 2, Winning Ways 2, Lasers Everywhere, Lasers Everywhere Alternative, Pintu and Fruits, Chef and DAG
April Challenge 2020 Division 2
Ready Bitwise, COVID Pandemic and Long Queue, Leaked Answers (Challenge), Sell All the Cars, Unit GCD, Factor Tree, Squared Subsequences, Strange Number
May Challenge 2020 Division 1
Triple Sort, (Challenge) Nanobots, Chef and Bitwise Product, Sorting Vases, Buying a New String
July Challenge 2020 Division 1
LCM Constraints, Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef
September Challenge 2020 Division 1
Chefina and Swap, Chef and Trump Cards, Find XOR, Rotate the Polyline, Move the Coins - Creating Tests, Divide Candies, Ada Matrix
China