Number Klotski - riddle puzzle

This number riddle puzzle - Number Klotski is a variant from the traditional Klotski puzzle.

Just a few seconds to work out the 3x3 challenge; it may requires quite a number of minutes solving the 9x9.
You can continue from last play, so don't worry about losing progress.

The rules, simple:
- Only one empty square, make good use of it.
- Every other blocks were assigned a unique number.
- Only one block or few continuous blocks could be moved towards the empty square at a time.
- Your mission: bring the blocks back to numerical order, from left to right, top to bottom.

Please feel free to reach out to me at [email protected] if you have suggestions or questions!