November 2009 (Contest X)
Help the DJ, The LCS Problem Revisited, The Best Box, SudokuX
February 2010 Contest
The Mine Field, Soccer League, Sorting device
March 2010 Contest
Treasure Hunting, K-important Strings, The Best Tower, Tri-Hexagonal Puzzle
April 2010 Contest
Flood, Travelling Salesman Again !, Adding Fractions
June 2010 Contest
Graph Counting, Pricing Tollbooths, Robot Game, Prime Pattern, Squirrel and chestnut
November 2010 Challenge
Randomly Testing Circuits
May Challenge 2012
Killing Gs, Little Elephant and Median, Jewels and Stones, Lucky lucky number, Divisible Pairs, Remember the recipe, A Home for Chef
June Challenge 2012
Little Elephant and Candies
