 Numbers in (red) are total possible solutions for this shape.Notes:Level 11 is also very difficult simply because there are so many possible orientations of each piece. At least with the 3rd layer added you can start using predefined sub shapes as is shown in the 3x3x4. And always count the cubes and colors to throw out pieces that cannot be part of the shape. This is where your logic really counts, particularly with that horrid 'H'.
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