Does anyone have Sudoku Gridmaster for the Nintendo DS? I think it's really good

Though it takes ages to do all 404 puzzles

I wrote a guide on gamefaqs.com if anyone want's to see it, just search for Sudoku Gridmaster, mine's the only one there at the moment, my name there is Tails7651. Tell me what you think of it (both the game and the guide)
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