Welcome to the new look dailykillersudoku.com. I've given the site a complete overhaul, so it's faster, has a cleaner design and now works on phones, tablets and desktops!
The online puzzle screen now has multi-cell updates, so you can highlight and modify multiple cells at once, and auto-sum, which will automatically sum highlighted cages. See the Help page for more information.
I hope you like it. If you have any suggestions, find anything that isn't working as you'd expect or just have something to say, please get in touch!
-- James, Daily Killer Sudoku