June Challenge 2013
Predictopus, Lapindromes, Dessert Wizard
July Challenge 2013
Chef and Walking on the rectangle , Count K-Primes
October Challenge 2013
Helping Lira, Maxim and Dividers, Yet Another Nice Girl
September Challenge 2016
Chef and Friends, Chef and digits of a number, Faded Palindromes, Chef and calculation
May Challenge 2017
Chef and Sub Array , Chef and Subsequences, Median of adjacent maximum numbers, Courses in an university, Chef and his daily routine
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
September Challenge 2017
Sereja and Commands, Little Chef and Sums, Fill The Matrix, Chef and Pick Digit, Minimum Good Permutation
October Challenge 2017
Chef and a great voluntary Program, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
December Challenge 2018 Division 2
Max and Electrical Panel, Chef and Interactive Contests, Chef and An Ideal Problem
December Challenge 2019 Division 2
Plus Multiply, That Is My Score!, Easy Subsequence Selection
January Challenge 2020 Division 2
Chef and Dynamo, Breaking Bricks
May Challenge 2021 Division 2 (Rated)
Xor Equality, Tic Tac Toe, Modular Equation
Philippines