Logic Masters Deutschland e.V.

Rules:

Normal sudoku rules apply.

A clue outside the grid is the sum of all the digits between the 1 and the 9 in the corresponding row or column.

A black dot between two cells means the digit in one of those cells is twice as big as in the other. Not all dots are necessarily given.

The gray lines are palindromes. The digits on them read the same forwards and backwards.

solving online with Cracking the Cryptic App: LINK

solving online at F-puzzles: LINK