Which of these would you prefer to see at christmas?
1. a 5X5X5 grid with 625 squares, that would be 7.7 times biger than the standard grid, shown below
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2. a 13 grid samurai with 3 layers, i would find it difficult to post one of those i'm afraid, that would be 11 times bigger than a standard grid
3. a killer sudoku samurai.
god that would be hard
4. Normal sudoku are hard enough.
Please feel free to add more suggestions