May Challenge 2012
Lucky lucky number, Remember the recipe, Jewels and Stones
June Challenge 2012
Little Elephant and Candies, Arranging Cup-cakes
September Challenge 2013
Chef and Integers , CAO Stage-1, CAO Stage-2
October Challenge 2013
Helping Lira, Maxim and Dividers, Kamehameha
November Challenge 2013
Square Digit Squares, Missing some chairs, Uncle Johny
December Challenge 2013
Chef and Codes, Funny Marbles, Magic Pairs, Reign, Rectangular Queries
January Challenge 2014
Magic Trick, Sereja and Graph, Bon Appetit, Please like me, Chef and Feedback
