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It's not supposed to look like this?
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No, on a 2d Sodoku, you can't repeat the same number in any square as well as in any row or column. So I would assume that a 3d cube sodoku can not repeat the same number in any band that goes all the way around the cube. So clearly in your pic, there are more than one 1's in the top row, travelling all the way around the cube, thus it is unsolved.
[/ QUOTE ] This can't be right b/c the 'band around' the cube contains 12 boxes not 9, thus can't be a restriction per sudoku rules.