November Challenge 2014
Chef and Segment Game, Chef and Words, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome, The Spelling Problem
August Challenge 2015
Gravity Guy, Cooking Machine
October Challenge 2015
Spheres, Rupsa and Equilateral Triangle, Who dares to be a millionaire, Count Subarrays, Time measure
December Challenge 2015
Chef and the stones, Plane Division, Oracle Devu and Longest Common Subsequence, Chef and Filters
September Challenge 2016
Chef and Friends, Dividing Machine, Chef and Matrix Division, Chef and digits of a number, Faded Palindromes, JosephLand, Chef and calculation
India