May Challenge 2014
Chef and Strange Matrix, Stone, Chef-jumping
June Challenge 2014
Chef and Digit Jumps, Chef and Subarray, Guessing Game, Forgot Password
October Challenge 2015
Count Subarrays, Rupsa and Equilateral Triangle, Spheres, Who dares to be a millionaire, Time measure
November Challenge 2015
Chef and collection of stamps, Eugene and function, Simple Sum, Chef and cakes
December Challenge 2015
Chef and Filters, Oracle Devu and Longest Common Subsequence, Chef and the stones, Plane Division
October Cook-Off 2015
Word Stem, Almost Sorted Permutation
November Cook-Off 2015
Sereja and Line, Sereja and Array and Subtracting
April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
December Cook-Off 2016
Chef and Subarrays, Chef and Subset
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums
August Lunchtime 2017
Mathison and the Dynamo shuffle, Mathison and pangrams
September Lunchtime 2017
Chef and Dice, Chef and Cook-Off Contests
United States