Objective: Recreate the given setup.

At the start you see 9 tokens carrying the numbers 1 through 9.
The board has 9 playing positions plus four additional ones, one at each side.
Click the board anywhere to let the system randomize the setup.

The tokens move like knights in chess: two steps in an orthogonal direction, then one step at right angles.
The target position must be empty.
Correct entries are shown in green.
You can switch the green highlighting off by clicking the 'change piece set' button.

You win once you have recreated the original setup (ordered numbers 1 to 9).

Fixed variants: there are also 3 variants with fixed setups.
Again you have to rearrange the numbers so that 1-2-3, 4-5-6, 7-8-9 are at the nine center positions.
Please note that is not known whether the puzzles 'fixed set-up 2' and 'fixed set-up 3' have a solution.
A partial solution to 'fixed set-up 3' is attached.