December Lunchtime 2018 Division 2
Choosing from Buckets, Age Calculator, Print Pattern
January Challenge 2019 Division 2
Yet Another Problem About Sequences, Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, A Pizza Slice
February Challenge 2019 Division 2
Deputy Chef, Art of Balance, (Challenge) Chef with Orchestra in the Kitchen, Appy and Contest, Chef and Magical Jars, Guess It Right, Manhattan Rectangle, Chef and Secret Ingredients
March Challenge 2019 Division 1
Chef and Soccer, Cheating on Queue, Yet Again a Subarray Problem, (Challenge) Interleaving Strings
April Challenge 2019 Division 1
Playing with Numbers, Subtree Removal, Kira Loves Palindromes, Offer for Chef
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Perfect Power Divisors, Ready Bitwise, Leaked Answers (Challenge)
January Challenge 2021 Division 1
Chef and Ants, Expected Number of SCCs
Australia