September Challenge 2017
Chef and Pick Digit, Little Chef and Sums, Minimum Good Permutation
October Challenge 2017
Max Mex, Counter Test For CHEFSUM, A Balanced Contest
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle
January Lunchtime 2018
Chef and Game with Sequence
February Challenge 2018
Car-pal Tunnel, Permutation and Palindrome, Chef And The Patents, Chef And His Characters
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove, Minions and Voting, Minion Chef and Bananas
April Challenge 2018 Division 2
Workers, Average of Pairs, Count Good Prefixes, Weight of Numbers, Cutting Plants, Chef and Array (Challenge), Highway Crossing
May Challenge 2018 Division 1
Fake Binary Search, Dibs on Fibs
December Challenge 2018 Division 1
(Challenge) Delete DAG, Max and Electrical Panel, Chef and Interactive XOR
October Lunchtime 2018 Division 2
Weird Question, Coloring the Grid, Three Friends
Dementia (Rated for Division 2)
Strings, Chef and Replication
Encoder (Rated for Division 2)
Knight Chess, Second Largest Element, Paint the Wall
April Challenge 2019 Division 1
Friend or Girlfriend, Maximum Remaining
October Challenge 2021 Division 2 (Unrated)
Longest AND Subarray, Digit Removal, MEX-OR, Which Mixture
India