September Lunchtime 2015
Sum of palindromic numbers
January Long Challenge 2016
Sereja and Salesman, Devu and Perfume, Chef and Time Machine, Churu and Balls, Rupsa and the Game
February Challenge 2016
Chef and Strange Operations, Devu and a light discussion, Rectangles of Love, Chef-Detective, Matrix Maximum Sum
April Challenge 2016
Help Watson Escape, Fibonacci Queries, Chef and Ballons, Devu and good strings, Chef And Magical Path, Chef And Coloring
May Challenge 2016
Laddu, Chef and Big Soccer, Forest Gathering, Sereja and GCD 2, Chef and Balls
August Challenge 2016
Chef and Chocolate, Chef and Round Run
September Challenge 2016
Chef and calculation, JosephLand, Faded Palindromes, Chef and digits of a number, Dividing Machine, Chef and Friends
December Challenge 2016
Train Partner, Kirito in labyrinth
December Challenge 2017
Chef and Universe, Total Diamonds, Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Red and blue points, Chef and Hamming Distance of arrays
Vietnam