To win you have to swap all the pieces over. You can only move one piece at a time, and it moves like a knight in chess (an L shape) into the unoccupied square.
The aim of this game is to finish it in the least possible time and in the least possible amount of moves. Got what it takes? These directions will show you how to do it. Numbering goes from left to right and each new line starts from the left.
06
03
12
09
18
15
08
17
14
23
20
13
16
07
14
25
18
21
12
01
08
05
14
07
18
15
24
17
08
11
02
13
22
11
08
19
10
13
04
15
08
11
22
13
