Logic Masters Deutschland e.V.

Notice: This is a Sudoku puzzle scrap I made for CCBC15 (a Chinese Puzzle Hunt, which has now ended), so Solution code is an English word or vocabulary.

Standard Sudoku rules apply, but the grid has been torn apart and scrambled (with no rotated or flipped). Solvers need to identify for themselves where each box is.

Killer rules apply. All shaded cells in the grid are covered by non-overlapping killer cages, and the clue values of the killer cages that appear in that box are given. All killer cages are four cells large, except for the killer cage with a clue value of 15, which is three cells large.

Boxes are numbered by convention from the left to the right and top to bottom such that the top left box is 1, top middle is 2, and so on. Within each box the cells are numbered the same way. Each box must have its box number in that position within the box (ie. box 1 has 1 in position 1, box 2 has 2 in position 2, etc.) No other digit in any box may be in its self-numbered cell.

Play this puzzle on SudokuPad (Full, Scrambled boxes, Blank Grid) or Penpa+ (Full, Scrambled boxes, Blank Grid)

*At the full version link, all content filled into the scrambled boxes will be ignored by solution checking.

Hint: How to extract
Notice the remaining green cells? You need to add up the numbers in each box in the green cells individually to convert them to letters.