June 2009 (Contest IV)
Product of divisors, Count the squares
July 2009 (Contest V)
Quadratic Equations, The White Knight, Johny the farmer, Sums in a cuboid
May 2010 Contest
Nice Quadrangles, Rendezvous
September 2010 Challenge
Brush Fire, Multiples of 3
November 2010 Challenge
Randomly Testing Circuits, Bombing
February 2012 Challenge
Lucky Count, Restore the Recipe, Lucky Long, Word Couting, Count of Maximum
August Challenge 2013
Little Elephant and Lemonade, Hello Hello, Save The Princess, Splitting Candies
