March 2009 (Contest I)
Johnny and the Beanstalk, The Rise and Fall of Power, Paying up
June 2009 (Contest IV)
Product of divisors, Count the squares
July 2009 (Contest V)
The White Knight, Sums in a cuboid
December 2009 (Contest XI)
Palindromic Numbers, Plant Location
February 2010 Contest
Soccer League, Sorting device
June 2010 Contest
Pricing Tollbooths, Robot Game, Tidying Posters, Prime Pattern, Squirrel and chestnut
February 2011 Contest
Coloring Colorable Graphs, Bogosort
April Long Contest
Gravel, Number Game Revisited, Graphs in Euclidean Space, Central Point, Rectangles Counting
May Long Contest 2011
Tree Product, The Great Wall of Byteland
April Challenge 2012
Fit to Play, Stacking Pancakes, Double Strings
May Challenge 2012
Little Elephant and Median, Jewels and Stones, Lucky lucky number, Divisible Pairs, Remember the recipe, A Home for Chef
