Logic Masters Deutschland e.V.

Heads up! This may feel more like math homework than your average puzzle. But, some of you secretly miss flying through those maths worksheets from elementary school... - so this one's for you.

The Rules:

1. [Fog Sudoku] Fill every row and column with the digits from 1-7. Correct digits will reveal surrounding cells.
2. [Circles] Every cell's "running total" is the sum of all the values in all the cells up to and including that cells value when looking in reading order. Ex: R3C2's running total is the sum of all the digits in Row 1, Row 2, and R3C1 and R3C2.
   
   A cell contains a circle if and only if the digit in the cell divides that cells running total evenly. (All circles are given!)

The Puzzle:

Try it on Sven's Sudokupad