Logic Masters Deutschland e.V.

The third of my vampires puzzles. This ruleset is SO fun to construct with. I'll probably set another puzzle with vampires in the future.

You can try the previous ones if you didn't already: Little thirsty vampires and Vampires in town.

Rules

Fill the grid with the numbers from 1 to 9 so that in each row, column, and 3x3 block each digit occurs exactly once.

All the lines are at the same time region sum lines and palindromes: in each line the sum of digits is the same within each box and digits filled into the line read the same forwards and backwards. For example, 243|342.

Hidden in the grid are nine vampires, one in each row, column and box. Different vampires contain different digits. Vampires take exactly one sip of blood from an orthogonally adjacent cell. For clues purposes (region sum lines and palindromes), vampire cells count as increased by exactly one and the taken cells count as decreased by exactly one. Two vampires cannot bite the same cell.

Vampires cannot appear on lines.

Vampires Magnet Butterfly is also available online on CTC-App.

Have fun solving and please leave a comment after your solve!

And thank you to zzw, mormagli and Piatato for testing this one!