Clueless
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Clueless is one of the Gattai Sudoku Variants that combines multiple Sudokus into a single puzzle.
A Clueless has 9 constituent Sudokus, in a 3x3 formation. The center box of each constituent Sudoku has no given digits. Together, these center boxes form a 10th Sudoku, without any given digits. This central Sudoku is essential in solving the puzzle, as it can pass eliminations from one constituent Sudoku to another.
Here is an example:
The center boxes have a blue color.
The following code string can be copied and pasted into various sudoku software programs that are capable of handling Clueless puzzles:
..17.46......8....8.5...4.23.......6.7.....9.6.......44.8...3.9....5......36.95.. ..72.53......7....9.2...8.63.......5.9.....8.7.......42.8...5.7....6......95.34.. ..86.93......3....4.9...6.76.......2.5.....8.8.......99.7...5.3....5......54.82.. ..52.73......5....2.9...6.76.......9.5.....7.3.......88.6...9.3....9......46.81.. ..78.65......9....2.6...4.93.......6.6.....7.9.......17.4...1.3....2......94.58.. ..85.49......6....6.5...2.44.......8.3.....6.7.......95.6...8.7....8......49.63.. ..52.74......8....9.2...8.55.......8.9.....1.6.......21.6...5.4....1......87.56.. ..46.28......8....6.5...7.22.......1.3.....4.5.......97.8...9.6....5......23.85.. ..85.49......7....9.5...6.45.......9.2.....5.8.......33.2...5.6....1......48.23..
