July 2009 (Contest V)
Sums in a cuboid, The White Knight
February 2010 Contest
Soccer League, Sorting device
March 2010 Contest
Treasure Hunting, K-important Strings, Tri-Hexagonal Puzzle
June 2010 Contest
Robot Game, Squirrel and chestnut, Prime Pattern, Tidying Posters, Pricing Tollbooths, Graph Counting
August Cook Off
Fetching Cooking Tools, Arranging the Appetizers, Cleaning Up
February 2012 Challenge
Lucky Count, Lucky Long, Word Couting, Count of Maximum
