Gapped Kakuro/en

Instructions

    

Enter a single digit from 1 to 9 into some cells so that the sum of digits in each Across entry equals the value given to the left of the entry, and the sum of digits in each Down entry equals the value given above the entry. No digit may be repeated within a single sum. Some cells may remain empty, and empty cells cannot be adjacent.

History

Invented by Serkan Yurekli (Turkey).