March 2009 (Contest I)
Paying up, Johnny and the Beanstalk
April 2009 (Contest II)
A Christmas Pizza Puzzle, Spaghetti Monsters, Battleship V, Squash the Bugs
April Challenge 2012
Fit to Play, Double Strings, Stacking Pancakes
September Challenge 2012
Kisses & Hugs, Chef World, Racing Horses, Queries About Numbers, ChefTown Parade, Three is Crowd
February 2013 Challenge
Climbing Stairs, Buy1-Get1
July Challenge 2013
Chef and Walking on the rectangle , Count K-Primes
September Challenge 2013
CAO Stage-2, CAO Stage-1, Project Spoon, Chef and Integers , Cool Guys, Little Elephant and Exams
October Challenge 2013
Helping Lira, Maxim and Dividers
November Challenge 2013
Superpowers of 2, Yet Another Cute Girl, Sereja and Vectors, Uncle Johny, Square Digit Squares, Missing some chairs
