September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
July Cook-Off 2016
Chef and Proportion, Chef and Numbers
February Challenge 2017
Chef and Triangles, Chef and His Apartment Dues
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
March Challenge 2019 Division 2
Chef got Recipes, Chef and Number Game
India