Logic Masters Deutschland e.V.

Another puzzle using the same variant as Penumbra (do check it out!). This one should serve as a slightly gentler introduction to the variant rule and get you used to how to think about it, though it's still not a complete pushover.

Normal Sudoku rules apply: place a number from 1 to 9 into each cell so that every row, column and box contains each number exactly once.

Shadow sums: A clue outside the grid gives the sum of all numbers in that row/column which are smaller than the number immediately before them, when reading from the direction of the clue.

For example, if a row contains the numbers 463752891, then the correct sum would be 3 + 5 + 2 + 1 = 11 from the left, and 8 + 2 + 3 + 4 = 17 from the right.