Instructions:
Fill numbers into empty fields (rooms), so that you pass successively across fairground 1, 2, 3, 4 ... and you stop only once in every room. You can enter and leave fairground only at the edge of fairground.
Example
You can enter into the fairground and leave the fairground only on the edge of fairground.
1
6
Solution
You can enter into the fairground and leave the fairground only on the edge of fairground.
1
8
9
2
7
6
3
4
5