Chains Sudoku

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Chains Sudoku is simple sudoku game with new feature: only unique numbers in cells of same color.

"Sudoku (数独 sūdoku) Listeni/suːˈdoʊkuː/, originally called Number Place, is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called "boxes", "blocks", "regions", or "sub-squares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.

Completed puzzles are always a type of Latin square with an additional constraint on the contents of individual regions. For example, the same single integer may not appear twice in the same 9×9 playing board row or column or in any of the nine 3×3 subregions of the 9×9 playing board." Wikipedia

There are no subregions in Sudoku Chains - only color chains with the same purpose.

Addictive puzzle with the spirit of 2048 but more ancient and epic.