Logic Masters Deutschland e.V.

Enter a number from 1 to 9 into each white cell. The numbers in grey cells indicate the sums of the numbers in the horizontally or vertically adjacent "words". Within each word, no number can appear more than once. (note that even if a "word" doesn't have a given sum, numbers still cannot appear more than once within it)

Also, some cells may remain empty but empty cells cannot share an edge with other empty cells.

Interactive version available here