January Challenge 2019 Division 2
Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, Yet Another Problem About Sequences
February Challenge 2019 Division 2
Manhattan Rectangle, Chef and Magical Jars, Chef and Secret Ingredients, Appy and Contest, Deputy Chef
March Challenge 2019 Division 2
Chef got Recipes, Chef and Number Game, Chef and a Beautiful Digit
April Challenge 2019 Division 2
Fencing, Subtree Removal, Friend or Girlfriend, Playing with Numbers, Maximum Remaining
April Challenge 2020 Division 1
Leaked Answers (Challenge)
March Cook-Off 2020 Division 1
Mysterious Sequence, Maximize Letter Beauty
May Cook-Off 2020 Division 2
Chef, Chefina and Their Friendship, Roads in Chefland, Impressing Chefina, Chef and Recipe
March Lunchtime 2020 Division 1 (Unrated)
Maximize LCM, Strip in a Tree!
June Lunchtime 2020 Division 1
Maximum AND, Gold Mining, Square Submatrices
India