Logic Masters Deutschland e.V.

Schrödinger Squishdoku: Place one or two of the digits 0-9 in every cell such that each 3x3 box includes all digits 0-9 exactly once and there are no repeated digits in any row or column. Cells on region borders (dashed lines) are shared between multiple boxes.
Dutch Flats: If a cell includes a 5, then the cell directly above it must include a 1 and/or the cell directly below it must include a 9.
Index Lines: If a digit D is included in the Nth position of a line (starting from the diamond), then the digit N must be included in the Dth position of that line.
Fortress: Each digit in a cell with ">" symbols is larger than all digits in cells that share an edge with it.

Rules