Author: Andrey Bogdanov
Fill in the grid with digits from 1 to 9 putting one digit per a cell. Each row, column and outlined area should contain every digit exactly once. The sum of the digits in each grey region must be identical. Digits can repeat within grey regions.
Grid control: Click at a cell reveals the value chooser. Click at the selected value changes the state of the cell. More details about grid control are at the help page.