Last month I already wrote about Giant Sudoku’s and suggested them to make the Sudoku’s not only printable format but available online.
Well at Giant Sudoku’s they have been very active and created some interactive versions of their Sudoku’s (4×4 to 36×36 and 9×9 Wordoku’s). You can not solve the puzzles online but the only application you’ll need is Microsoft Excel.
All other formats of Giant Sudoku’s are still online (like 16×16, 25×25, 36×36, 49×49, 64×64, 81×81 and 100×100, so Sudoku’s with grids from 256 to 10000 cells). Happy Puzzling!