Logic Masters Deutschland e.V.

This puzzle is another shikaku-sudoku hybrid, this time with an additional diagonal constraint. Earlier puzzles are Shikasudoku and Shikasudoku 2.

Normal digaonal sudoku rules apply: each row, each column, both indicated diagonals, and each region indicated by thick borders in the grid must contain the digits 1 to 9 once each.

Additionally, shikaku rules apply:

• Divide the grid into rectangular regions of orthogonally connected cells. Each rectangle contains exactly one circle. A single cell with a circle counts as a 1x1 rectangle.
• A number in a circle represents how many cells are in the rectangle the circle belongs to.
• Rectangles cannot overlap.
• Every cell in the grid is part of a rectangle.
• Digits may repeat in a rectangle if allowed by other rules.

See below for examples.

You can play this puzzle online using:

• Penpa+ with answer check: https://tinyurl.com/8v5ddz3z
• CTC app: https://tinyurl.com/2p8jfn9w
• f-puzzles: https://f-puzzles.com/?id=y928h4ug

Hope you'll enjoy!

Examples for the shikaku-sudoku hybrid ruleset:

You can try it over here on f-puzzles: https://f-puzzles.com/?id=yeuknp9h or Penpa+: https://git.io/JXgfq.

An easier 6x6 puzzle to get familiar with some of the logic is this:

You can try it over here on f-puzzles: https://f-puzzles.com/?id=ygme6y69 or Penpa+ with answer check: https://git.io/JPxw4.