December 2009 (Contest XI)
Palindromic Numbers, Maze of Digits, Plant Location, The N Queens Puzzle Revisited
January 2010 (Contest XII)
Place the balloon, Circle of towers, Cell Phone Towers , Wildcard Matching, Lost Primes
March 2010 Contest
Heroes of Magical Might, Traffic jam, Tri-Hexagonal Puzzle, The Best Tower, K-important Strings, Treasure Hunting
June 2010 Contest
Graph Counting, Pricing Tollbooths, Robot Game, Tidying Posters, Prime Pattern, Squirrel and chestnut
