Logic Masters Deutschland e.V.

Here's a sequel to a puzzle I constructed a few weeks ago. The rules are almost the same as "Close Friends", except white circles now deal with the sum of surrounding friendly digits rather than the amount of surrounding friendly digits. Comments and ratings are much appreciated. Hope you enjoy!

Rules:

Normal sudoku rules apply.

Odd/Even: A digit in a gray square must be even. A digit in a gray circle must be odd.

Close Friends: A digit in a white square must be friendly. (A digit is said to be "friendly" if it matches its row, column, and/or box number.)​

A digit in a white circle must be the sum of the surrounding friendly digits, not including itself. (In other words, the sum of the friendly digits that are orthogonally and diagonally adjacent to the white circle.)

Not all white squares/circles are necessarily given.

Solve on Cracking the Cryptic

Solve on F-Puzzles

Puzzle: