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Iron Sudoku - Today's Time Waster

I've featured super-addictive logic puzzle Sudoku as a Time Waster before, so it feels like cheating to mention it again, but I've found a great new Sudoku site called Iron Sudoku. While I'm still partial to the version's mousewheel-driven interface, Iron Sudoku's non-Flash interface (yes, that's AJAX you smell) is easy to use and efficient enough for speed-players. It also has two di...