Logic Masters Deutschland e.V.

Rules:

Normal Sudoku rules apply.

Hashiwokakero rules: Connect islands (circles) using horizontal and/or vertical non-intersecting bridges (lines) so that all islands are interconnected. The number on the island determines how many bridges are connected to it. Max. 2 bridges can be connected between two islands.

X-sum rules: Clues at the edge of the grid show the sum of the first X digits, where X is the first seen digit.

Puzzle Link: Sudokupad

If you like this ruleset and want to do more:
• 3 stars difficulty: Hashidoku
• 4 stars difficulty: Killer Islands