Here is a pencilmarked grid that has no more basic solving techniques:įor this grid, the starting digit is an easy choice, looking at the pattern for digit 3. These bivalue cells allow you to expand the coloring clusters beyond the single digit boundary. To select the best starting digit, pick a digit that has 2 or more conjugate pairs, and several of its candidates are located in bivalue cells. Choose a starting digitīecause you should try regular coloring before 3D coloring, you must already have some idea about the coloring possibilities for each digit. When there are only 2 candidates in a line in any of the 3 dimensions, you can give them opposite colors, building clusters as you would do in 2D coloring.īecause it is a little fat-fetched to turn every Sudoku into a 3D model, there are a few simple rules that allow you to perform this technique in a 2-dimensional pencilmark grid. Since there are 9 digits, there are 9 layers in this cube. To see the 3-dimensional picture, think of each plane as a layer in a 3D cube. When you apply colors to the candidates for a single digit, you are working in a 2-dimensional plane of 9 rows by 9 columns. How it worksģD Medusa expands the rules for Simple Colors and Multi-Colors to include multiple digits. When multiple clusters are used, this technique allows you to locate every candidate-to-candidate chain in the grid. When the technique is limited to a single cluster, you can also replicate its effects by placing Equivalence Marks in the pencilmark grid, making it a good advanced technique for pencil and paper solvers. 3D Medusa or Advanced Coloring is a coloring technique which considers multiple digits.
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