February Challenge 2021 Division 3
Team Name, Another Tree with Number Theory, Chef and Meetings, Prime Game, Multiple Games, XOR Sums, Maximise Function, Cut the Cake (Challenge), Highest Divisor, Frog Sort
March Challenge 2021 Division 2
Space Arrays, Maximum Topological Sort, Paparazzi Gennady, College Life 4, Dense Graph, Interesting XOR!, Consecutive Adding
April Challenge 2021 Division 2
Binary String MEX, Worthy Matrix, Chef and Dice
May Challenge 2021 Division 2 (Rated)
An Interesting Sequence, Modular Equation, Tic Tac Toe, Xor Equality, King Killing, Tree House, Valid Paths
November Challenge 2021 Division 1 (Unrated)
Xor Equation, Weird Palindrome Making, Hill Sequence, Maximise the bridges
China