Logic Masters Deutschland e.V.

This puzzle originally appeared on BremSter's YouTube channel, which I highly encourage you check out if you are interested in solves of relatively approachable sudoku puzzles. Thanks again to BremSter for featuring it there!

Ratings, comments, and feedback are much appreciated! Please feel free to reach out to me on Discord if you have any comments or questions. Please also feel free to try my other puzzles here.

Rules:

• Quattroquadri sudoku: Place the digits 1 to 9 once each into the 3x3 boxes. Digits may not repeat in the same row, column, or box of the 6x6 grid.
• Killer: Digits in cages must sum to the small number in the top left corner of the cage. Digits in cages must not repeat; this includes cages outside the grid.
• Numbered rooms: A clue outside the grid indicates the digit which has to be placed in the Nth cell in the corresponding direction, where N is the digit placed in the first cell in that direction.
• Each caged cell outside the grid must contain a valid numbered rooms clue.

SudokuPad: https://sudokupad.app/n324s8i5n0

Penpa+: https://tinyurl.com/2adm5dod

Note: In SudokuPad, the killer calculator may not give all valid options for cages due to limitations of the software. Solver beware!