December Challenge 2019 Division 2
Plus Multiply, Binary XOR, Easy Subsequence Selection, Sticky Notes, That Is My Score!, Addition, Chefina and Ranges
January Challenge 2020 Division 2
Chef and Dynamo, Doraemon, Doofish Matrix, Equality, English, Breaking Bricks
February Challenge 2020 Division 1
Long Contest and Cook Off Overlaps, No Change Required, Chef and Railway Stations, Expected Change
April Challenge 2020 Division 2
Strange Number, Squared Subsequences, Unit GCD, Sell All the Cars, COVID Pandemic and Long Queue
May Challenge 2020 Division 2
Sorting Vases, Isolation Centers, Coronavirus Spread, Triple Sort
June Challenge 2020 Division 1
The Tom and Jerry Game!, Operations on a Tuple
July Challenge 2020 Division 1
Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef
Australia