Hard Cross Sudoku Puzzles

Cross Sudoku is a variant of the classic Sudoku puzzle that involves more complexity and challenge due to its structure. It consists of five standard 9x9 Sudoku grids arranged in such a way that they intersect at one common grid, forming a giant cross-like structure.

The central grid is shared among all the other four, which are placed on each side (top, bottom, left, and right) of it.

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Basic Rules (Same as Classic Sudoku):

  • Grid Structure: The puzzle comprises five 9x9 grids, with one central grid and four additional grids arranged around it, creating a cross formation.
  • Number Placement: Each grid must be filled with the numbers 1 through 9.
  • No Repetition: Numbers must not repeat within any row, column, or 3x3 sub-grid of each 9x9 grid.

Extra Rule for Cross Sudoku:

  • Intersecting Grids: The central grid is shared by all the other grids and must adhere to the rules of each connected grid simultaneously.
  • Independence: While the grids are interconnected, the left, right, top, and bottom grids function independently from one another, except for their interaction with the shared central grid.

Solving Tips:

  • Start with the Central Grid: Begin by solving the central grid, as it is shared by all other grids and provides crucial clues for the surrounding grids.
  • Single Possibility: Identify squares where only one number can fit, based on Sudoku rules.
  • Elimination: Eliminate impossible numbers from a square by considering its row, column, and 3x3 sub-grid.
  • Look for Grid Independence: Focus on solving the rows, columns, and squares in the outer grids that do not intersect with the central grid, as these can be tackled like a standard Sudoku puzzle.
  • Use Pencil Marks: Use pencil marks to note possible numbers in each square and update them as you progress to keep track of potential options.