Logic Masters Deutschland e.V.

Let me explain the name of this puzzle first: Adidas has 3 stripes, some faked Adidas sneakers have more.

It is my first submission here on LMG. Please let me know if I chose an unmatching difficulty. Any other feedback is also highly appreciated.
Classic Sudoku, Palindrome, Little Killer, and Killer rules apply.

Penpa link: git.io/JtVYk ❶ Palindrome: Digits along grey lines form palindromes. That means that the sequence of digits reads the same forwards and backwards, e.g. 1234321
❷ Little Killer: Arrows indicate the sum of the digits that appear in the diagonal they point towards. Digits may repeat along these diagonals
❸ Killer: Digits appearing in cages sum to the number given in the cage. Digits may not repeat within cages
❹ The xs in the killer and little killer clues are a variable that has to be deduced by the solver