May Challenge 2012
Jewels and Stones, Lucky lucky number, Remember the recipe, A Home for Chef
February 2013 Challenge
Little Elephant and Cards, Buy1-Get1, Magic Board, Triangular Queries, Climbing Stairs, Word Play
February Cook-Off 2013
Row and Column Operations
March Challenge 2013
Random decreasing function, Tourist Translations, Approximately, Fire Escape Routes
December Challenge 2013
Lucy and the Flowers, Cube Cakes, Chef and Codes, Funny Marbles, Magic Pairs
February Challenge 2014
Chef and Favourite Sequence, Graph Challenge
