September Challenge 2015
Count Steps in Matrix, Lighthouses, Chain of Doughnuts
December Challenge 2015
Chef and the stones, Plane Division, Oracle Devu and Longest Common Subsequence, Chef and Filters
December Challenge 2018 Division 1
Max and Electrical Panel, Chef and Interactive XOR, Directing Edges, Colorblind Feast, (Challenge) Delete DAG
November Challenge 2018 Division 2
Chef and Ridges, Appy Loves One, Good Median, Magician versus Chef 2, Binary Strings, Chef and Difficult Contests, Chef and Happiness
Poland