October Challenge 2015
Who dares to be a millionaire
September Lunchtime 2015
Sum of palindromic numbers
April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
August Cook-Off 2016
Tweedle-Dee and Tweedle-Dum
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, Bandwidth of a matrix
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator
India