A Disk can only be moved by jumping over an adjacent disk, or an in-line sequence of disks, to the first vacant square beyond them. All jumped-over disks then flip to the opposite color (black or white). Both black and white disks may be moved or jumped. Jumps may be made in any orthogonal or diagonal direction.
The object is to change all disks to black.
 
There are a number of different puzzles (variants). These are fairly easy puzzles, so the challenge is to complete them in as few moves as possible. The fewest known moves are listed in the strategy section. These were all hand-solved by the designer, not a computer, so it may be possible to beat them!