February Challenge 2020 Division 2
Expected Change, No Change Required, The Theatre Problem, School of Geometry, Hard Cash, (Challenge) Raisins, Long Contest and Cook Off Overlaps, Chef and Railway Stations
March Challenge 2020 Division 1
Egg-free DAG, Good Subsequences, (Challenge) 300 IQ Ants, Lasers Everywhere Alternative, Lasers Everywhere, Winning Ways 2, Break, Chef and DAG, Inverse of a Function
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Perfect Power Divisors, Ready Bitwise, Factor Tree
February Lunchtime 2020 Division 2
Coronavirus, Secret Mission, Monsters Battle, Not All Flavours, Swapping to Palindrome, At the Gates
August Challenge 2021 Division 2 (Unrated)
Special Triplets, Array Filling, Chef and Bulb Invention, Problem Difficulties, Olympics Ranking
China