Logic Masters Deutschland e.V.

Rules:

• Normal sudoku rules apply.
• Cells can be either not shaded, or be half-shaded diagonally, creating right-angled triangles. (CTC app doesn't let this, but you can use the pen tool to draw diagonal lines).
• Cells can't be fully shaded.
• Unshaded zones must form rectangular (or square) killer cages. Due to the diagonal shading nature, those zones can be turned 45 degrees.
• If killer cage has a cell with a number in a corner, its cells must sum to that number.
• Digits on a border of diagonally rotated rectangles only contribute half of their value.
• Digits may repeat in killer cages, but their values may not, e.g. cage may have 4 or border (value 2) and 4 in the center (value 4) of a killer cage, but not 4 or border and 2 in the center (both have value 2).

Example:

Solve in:

• f-puzzles
• CTC app
• Penpa