December 2009 (Contest XI)
Effective Sets, Palindromic Numbers, Maze of Digits, Plant Location, The N Queens Puzzle Revisited
January 2010 (Contest XII)
Circle of towers, Cell Phone Towers , Lost Primes
February 2010 Contest
Soccer League, The Mine Field
March 2010 Contest
Treasure Hunting, K-important Strings, The Best Tower, Tri-Hexagonal Puzzle
February Cook - Off Challenge
Breaking Into Atoms, Three Way Communications
March 2011 Challenge
The Amazing All-In-One Cooking Machine - Challenge, Omax, Squares Game, K-Unique Sequence, Buying Land
March Cook-off Challenge
Money Transformation, Snake Snaky, Grouping Chefs
April Long Contest
Gravel, Number Game Revisited, Central Point, Rectangles Counting
May Long Contest 2011
Tree Product, The Great Wall of Byteland, Pruning Trees
June Cook-off
Correctness of Knight Move, Super-plane
March 2012 Challenge
Longest Weird Subsequence, Cosine Partition Function, Lucky Number, Free Shuttle Service, Home Delivery, Spoon in Matrix
