Hello,
Thank you for nice welcome
You have very interesting site with a lot of puzzles - and not only sudoku
But I suggest you should do (if it is possible) something with online playing interface, because now You have to click so many times to enter digits... its really slowing down..
Also the way how the pencilmarks are handled could be better... For exmaple look at the FED Sudoku site
http://www.fed-sudoku.eu/enindex.php (where I would like to invite all of you).
But puzzles seems to be very good here (especially I like the consecutive and nonconsecutive sudokus) and mothly sudoku contest (in which I participated today) is very nice idea - I like all types of competition, so it is good I found your site
Good Luck to all of you and keep improving this puzzle site.
Have a nice day!