Hello,
I've recently published a set of similarly looking sudoku applications (web, android) and would like to invite you to check them out.
They both have somewhat similarly looking clients and generate puzzles on demand.
Both apps support cell first/digit first inputs, undo/redo, pencil marks and save progress locally, also can solve puzzles.
Web version supports import/export sudoku puzzles and also packaged as a Facebook web app to support Facebook specific exports (post/message).
This site has links to all versions
http://sudoque.com
And these are individual links
http://sudoque.com/play/
http://apps.facebook.com/sudoque/
https://play.google.com/store/apps/details?id=com.amalgamatedservice.sudoku.free
Thank you and I hope You'll find them useful.
I'd be glad to address questions or receive any sort of feedback