Logic Masters Deutschland e.V.

I listened to this old classic the other day with my kids and noticed the large amount of repeating letters in the title and decided that I needed to try to set a puzzle themed on it.
Happy with that I managed to get a working, but it still irks a bit that the last E clue didn't fit with the puzzle. Can't have everything in life, I suppose. :)

RULES:
- Standard 6x6 sudoku rules apply.
- Numbered rooms: Clues outside the grid indicate the digit in the Nth cell in the corresponding direction, where N is the digit placed in the first cell in that direction. Small letters outside the grid are just for aesthetics.
- Cipher: Each letter corresponds to a unique digit. If a letter is in the grid, its corresponding digit goes in that cell.

The puzzle:


With background:


Enjoy!

Link to solve it online:
SudokuPad
SudokuPad (with background)

Mandatory background music: PIKOTARO - PPAP
Challenge: Solve it before the song ends!