November 2009 (Contest X)
SudokuX, The Best Box, Help the DJ
December 2009 (Contest XI)
The N Queens Puzzle Revisited, Palindromic Numbers
January 2010 (Contest XII)
Cell Phone Towers , Wildcard Matching, Lost Primes, Jawbreaker
February 2010 Contest
Toll Trolls, Soccer League, Sorting device
May 2010 Contest
Summing Slopes, Rendezvous, Nice Quadrangles
June 2010 Contest
Pricing Tollbooths, Robot Game, Prime Pattern, Squirrel and chestnut
June Long Contest 2011
Maximal Score Path, Chef Teams, Restock
June Cook-off
Correctness of Knight Move
July 2011 Long Contest
Large Kitchen, A-E Hash Function, Most Popular Friend
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
