September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Sum of Cubes, Querying on a Grid, Weasel does Xor on Tree, Weasel finds Staircase, Fill The Matrix, Little Chef and Sums, Sereja and Commands
June Challenge 2018 Division 2
Vision, Naive Chef, Binary Shuffle, Sheokand and String, Expected Buildings, Ways to Work, Two Flowers
September Challenge 2018 Division 1
Bad Shuffle, Table Game, Factorize, Chef and Condition Zero (Challenge), Sasha and Photos, Selinas the Chefs Falling on the Tree, AND Square Subsegments, Chef and Lost Story
December Challenge 2018 Division 1
Before Having Donuts, (Challenge) Delete DAG, Colorblind Feast, Max and Electrical Panel, Directing Edges, Edge Addition, Chef and Interactive XOR, Chef and Working Plan
November Challenge 2018 Division 1
Chef and Equations, Binary Strings, Magician versus Chef 2, Chef, Primes and Trees (Challenge), Good Median, Appy Loves One, Max-digit Tree, Chef and Recipes
June Challenge 2019 Division 1
Lent Money, Count Arrays, Chef and Ingredients, Intersecting Paths, Sum and GCD, Forgotten Tree 9
China