July 2009 (Contest V)
Lights Off, Sums in a cuboid, Lights Off, Revisited!, The White Knight, Quadratic Equations, Johny the farmer
September 2009 (Contest VIII)
A Bowling Game, Smart Frog, A Coin Game
November 2009 (Contest X)
The LCS Problem Revisited, The Best Box
January 2010 (Contest XII)
Circle of towers, Jawbreaker, Lost Primes, Wildcard Matching, Cell Phone Towers
February 2010 Contest
The Mine Field, Soccer League, Sorting device
March 2010 Contest
Tri-Hexagonal Puzzle, The Best Tower, Treasure Hunting, K-important Strings
June 2010 Contest
Graph Counting, Pricing Tollbooths, Robot Game, Prime Pattern, Squirrel and chestnut
July 2010
Rearranging Digits, Block Tower, Maximal crosses, Happy Days, Closest Ranking
August Cook Off
Fetching Cooking Tools, Arranging the Appetizers, Cleaning Up
November 2010 Challenge
Randomly Testing Circuits, Bombing, Graph Challenge, Chefs Bad Day, Balanced Walks
