Logic Masters Deutschland e.V.

This puzzle was created for zetamath's May/June puzzle setting challenge. This is my first attempt at setting a non-sudoku puzzle, so any comments or feedback would be 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:

• Shade some empty cells dark gray to create a single orthogonally connected canal. Numbered cells cannot be shaded as canals, and canal cells cannot form a 2x2 square anywhere in the grid. Each numbered cell indicates the total number of shaded canal cells connected vertically and horizontally (in a straight line) to that numbered cell.
• In addition, each unshaded (ie, non-canal) region must be colored entirely as a single color selected from red, green, or blue. The clues outside the grid indicate the number of orthogonally connected unshaded cells of the respective color(s) in that row or column. If clues outside the row/column are given, those are all the clues for that row/column, and they appear in the same color order as the unshaded regions in that row/column; rows/columns without clues may have any number of unshaded cells. Unshaded cells of different colors must not touch orthogonally (ie, they must be separated by at least one canal cell). All numbered cells must be colored along with the other cells in their respective region.

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

Please note: The Penpa+ auto-solver will not detect a solution for this puzzle. Please enter the solution code as instructed below to check your answer.