March 2009 (Contest I)
Paying up, Johnny and the Beanstalk
May 2009 (Contest III)
The powerful sum, Healthy dinner party
June 2009 (Contest IV)
Product of divisors, The Lucky Draw, The battlefield, Count the squares
July 2009 (Contest V)
Sums in a cuboid, Lights Off, Revisited!, The White Knight, Quadratic Equations
August 2009 (Contest VI)
Magic sequence, Bytelandian Robots, Curry Stained Napkin, Golf course
November 2009 (Contest X)
The LCS Problem Revisited, The Best Box
May 2010 Contest
Rendezvous, Summing Slopes, Nice Quadrangles
December 2010 Challenge
A String Game, Byteknights and Byteknaves, The Hungry Bear
January Challenge 2013
Little Elephant and Alcohol, The Minimum Number Of Moves, End Of The World, Chef of the Year
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix, Bank robbery
United States