Sunday Contest
From Speedsolving.com Wiki
Sunday Contest is an unofficial online weekly contest, active since 2004. It was hosted in 2004 by Tyson Mao. Since 2005, it has been hosted by Jon Morris. In its current form, there is only one category, an average of 12 for 3x3 speedsolving.
Tyson's weekly for-fun puzzle was the inspiration for mystery puzzles.