Logic Masters Deutschland e.V.

Fill SOME cells of the grid with digits such that digits do not repeat within a house (row, column, or region), and each house contains all digits 1 through N, where N is to be determined for each house.

Renban: On each purple line, the digits are consecutive (in any order) and do not repeat.

Region sum lines: On each blue line, digits on the line sum to the same value within each region the line passes through. The line is considered to pass through the region even if all the cells in the region are empty.

Each clue line must pass through at least one digit. (As a consequence, a region sum line must pass through at least one digit in each region.)

Play this puzzle in SudokuPad. I recommend turning off automatic solution check for this puzzle. Since the solution may contain empty cells, solution check will trigger when all nonempty cells are filled correctly.

Submitted to zetamath's Sortadoku challenge and solved on stream.