April Challenge 2015
Devus and their voting system, Count Sequences, Little Party, Chef and Piano Scales, Division of Lands, Inversion sorting, Broken Telephone, Chef and Interview, Chef and Array
June Cook-Off 2015
Longest non regular parentheses sub-sequence, Strange operations
January Long Challenge 2016
Asteroids, Devu and Perfume, Chef and Time Machine, Cyclist Race, Churu and Balls, Rupsa and the Game, Chef and Inflation, Sereja and Salesman, Chef and Making Triples
April Challenge 2016
Chef And Magical Path, Chef And Coloring, Devu and good strings, Chef and Ballons, Fibonacci Queries, Help Watson Escape
May Challenge 2017
Chef and Sub Array , Long Sandwich , Gotham PD, Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences
Japan