July 2009 (Contest V)
Lights Off, Revisited!, The White Knight, Sums in a cuboid
November 2009 (Contest X)
SudokuX, Help the DJ, The LCS Problem Revisited, The Best Box
December 2009 (Contest XI)
Maze of Digits, Plant Location
January 2010 (Contest XII)
Circle of towers, Lost Primes
February 2010 Contest
Soccer League, Sorting device, The Mine Field, Toll Trolls
March 2010 Contest
Treasure Hunting, K-important Strings, The Best Tower, Tri-Hexagonal Puzzle, Traffic jam
April 2010 Contest
The Reversed World, Flood, Travelling Salesman Again !, Adding Fractions
May 2010 Contest
Nice Quadrangles, Rendezvous
June 2010 Contest
Robot Game, Prime Pattern, Squirrel and chestnut
July 2010
Closest Ranking, Happy Days, Maximal crosses, Block Tower
August Cook Off
Arranging the Appetizers, Cleaning Up
October 2010 Challenge
Integer Combinations Of Vectors
January 2011 Challenge
Count Relations, Flu Shot Lineup
April Long Contest
Gravel, Number Game Revisited, Graphs in Euclidean Space, Central Point, Rectangles Counting
October Long Contest 2011
Dish Distribution, The Great Plain, The Baking Business, Repeated String, Lucky Palin
