I have received a lot of positive feedback on my Clueless Special format, in which 9 sudoku puzzles are connected into a 10th puzzle made up of the center nonets (3x3 boxes).
A new Clueless Special is available each monday, 12 am CET, at the clueless page.
18 of these monster puzzles have been published so far, and all of them can be found in the clueless archive at sudocue.net.
If you like a competition, you can submit your solution for the latest Clueless Special. No prizes or medals, but the names of the contestants will be shown, in the order the submissions came in. If you like to be on top of the list, be faster than others. You still have more than 2 days to join the clueless 18 rankings.
cheers,
Ruud.