Very well done - like a little Scrabble board with tiles and a well thought out grid. Maybe it's the 3D aspect of looking at the puzzle, or maybe it's a quick way to see which numbers are missing, or maybe it's a combination (or maybe just my imagination), BUT overall it's a great one puzzle game. - decisive decision. I try different paper puzzles and if I can't solve them, I rip out the puzzle, put it on the board and work on it until I get it right. Black numbers for presets, red numbers for the ones you entered, and for "doubtful/possible" I place sideways (in red) on the grid so I know which ones to use if I come across a "non-working " solution bump. delete and start over. As I said, I'm 100% in - have fun! If you like Sudoku, this is a great investment. (Be careful, the box with the tiles is not clearly marked; this is the side of the grid where "BOHS" is embossed. Be careful, otherwise the tiles can easily fall out!) :-) PS The name "Sudoku" is an abbreviation of the Japanese suuji wa dokushin ni kagiru and means "numbers (or figures) must remain separate".
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