Logic Masters Deutschland e.V.

This puzzle is superrabbit's christmas present for the (dreadful) Secret Satan event in the CTC discord. Her tastes in puzzles inspired this one heavily. I want to also mention as my inspirations the magnificent Yin Yang Kropki Sudoku by Phistomefel, Agent's YY hybrid series and Mr.Menace's Masyudoku.

This puzzle is purposefully on the harder side, so feel free to ask for a hint or a sanity check here in hidden comment or in discord (#9007). Have fun solving, I'll be happy to read your comments!

Rules :

Normal sudoku rules apply.

Yin yang : shade some cells, so that all shaded cells are connected, all unshaded cells are connected, and no 2x2 area is either fully shaded or fully unshaded.

Masyu : draw a non-intersecting loop through the centers of some cells that passes through every circle. The loop must turn on black circles and travel straight through the cells on either side. The loop must go straight through white circles, and turn in at least one of the cells on either side.

Each cell clued with a small number must contain a masyu circle that is black if the cell if shaded and white if the cell is unshaded. The clue indicates the sum of all digits on the loop (including the digit in the circle) that are the same color as the circle, up to (and including) the cells on both sides of the clue where the line bends. Digits may not repeat in such a sum.

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Example puzzle : Yin Masyang
You can play this example puzzle by clicking this link (penpa) (difficulty 3.5/5).



See also this example picture that illustrates the ruleset :