Sandwich Sudoku contains extra numbers outside the grid. These extra clues indicate the sum of digits between 1 and 9 in the corresponding row or column.
Each region must contain the numbers 1 to 9, without repetitions.
Here are some tips for solving Jigsaw Sudoku puzzles:
Start by looking for clues in the existing numbers. For example, if a number appears only once in a row, then it must be the missing number in that row.
Look for patterns in the numbers. For example, if a number appears in two of the three rows in a region, then it must also appear in the third row.
Use elimination to rule out impossible numbers. For example, if a number appears in a row and a column, then it cannot also appear in the corresponding region.
Be patient and persistent. Jigsaw Sudoku puzzles can be challenging, but they are also very satisfying to solve.
I hope these tips help you solve Jigsaw Sudoku puzzles.
Here are some of the differences between Sudoku and Jigsaw Sudoku:
Sudoku uses 3x3 blocks, while Jigsaw Sudoku uses irregular-shaped regions.
Sudoku has a fixed number of regions (9), while Jigsaw Sudoku can have a variable number of regions.
Sudoku regions are all the same size, while Jigsaw Sudoku regions can be of different sizes.
Sudoku is generally easier than Jigsaw Sudoku.