Logic Masters Deutschland e.V.

Today I am happy to present a hybrid of tetromino and sudoku :-)
I hope you will enjoy and I would be really grateful for all the comments and ratings.

Tetromino:

Tetrominoes: Shade some cells in the grid to form tetrominoes (blocks of 4 cells), which cannot be orthogonally adjacent, and must form a diagonally contiguous area. Two tetrominoes which touch each other at the corners must have different shapes, counting rotations and reflections as the same. Additionally, no 2×2 region is entirely unshaded.

Kropki dots: Cells joined by a white dot are both unshaded, cells joined by a black dot are both shaded, and cells joined by a gray dot are one unshaded and one shaded.

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Sudoku:

Normal sudoku rules apply.

Killer: Digits in a single tetromino may not repeat and sum to 23.

Kropki dots: Digits in cells joined by a white dot are consecutive. Digits in cells joined by a black dot are in a 1:2 ratio (i.e., one digit will be double the other). Not all dots are necessarily given.

X/V: Digits in cells joined by an X sum to 10. Digits in cells joined by a V sum to 5. Not all Xs and Vs are necessarily given.

SudokuPad Link

Tetromino Explanation:

You can see on the example above (author bakpao) how tetromino works. You can also try to play a big tetromino puzzle before you solve the sudoku, link here (author jovi_al, puzzle came from the GAPP series in the CtC Fan Discord). Rules are also explained here.