March 2009 (Contest I)
Some More Homework, Johnny and the Beanstalk, Paying up, The Guessing Game, Place the mines!, The Rise and Fall of Power
April 2009 (Contest II)
Packing the Boxes, A Christmas Pizza Puzzle, Spaghetti Monsters, Battleship V, Squash the Bugs, Bubbles
May 2009 (Contest III)
The powerful sum, Healthy dinner party, Best board fill, Prime words, An interesting subsequence, Swapping mismatches
June 2009 (Contest IV)
Product of divisors, The Lucky Draw, The battlefield, Primes in the GCD table, Pack the balls in a box!, Count the squares, Alien Clock
October 2009 (Contest IX)
A puzzle game, Forces in the crystal, Kayaks, Paragraph Formatting, Congruent triangles, Just a simple sum
November 2009 (Contest X)
SudokuX, Help the DJ, Magic Strings, Help the judge, The LCS Problem Revisited, The Best Box
December 2009 (Contest XI)
Maze of Digits, Plant Location, Palindromic Numbers, Effective Sets, The N Queens Puzzle Revisited, Park tour
January 2010 (Contest XII)
Place the balloon, Circle of towers, Cell Phone Towers , Wildcard Matching, Lost Primes, Jawbreaker
May 2010 Contest
Lights Out, Nice Quadrangles, Rendezvous, Generalized Spanning Trees, Summing Slopes
