March Challenge 2013
Tourist Translations, Approximately, Fire Escape Routes, Minesweeper, Random decreasing function
February Challenge 2015
Let us play with rank list, Chef and Equality, Jigsaw Puzzle Solving, Chef and Strings, Chef and Strange Formula, Time to Study Graphs with Chef, Chef and Chain
July Challenge 2015
Maximum Difference Walk, Sereja and Game 2, Bread, MasterChef, Na2a and lucky stone, Chef and Cube, Rohith and Circles
Japan