This is a variant of jigsaw sudoku.
Jigsaw Sudoku rules apply:
Each row, column, and each region contain numbers 1~5.
Knight's Tour rules apply:
The knight moves from the marked cell according to the rules of chess to the end of the star cell,
and the numbers on the movement path start from 1 and gradually increase to 5 then getting in the loop.
The knight may not pass through the given numbers.
Here is the example puzzle:
Try examle puzzle.
Main Puzzle:
CTC link.
Penpa link. Enjoy the puzzle :D