# Solution for Peter Knoppers' Eighteen Eights puzzle

These images depict the assembly process of Peter Knoppers' Eighteen Eights puzzle. This puzzle has six solutions that are very similar.

## The pieces

There are two different kinds of pieces used in Eighteen Eights;
10 copies of the figure 8 piece (shown in green).
8 copies of the figure 3 piece (figure 8 with two units removed) (shown in red).

## The assembly process

(Images created with POV-Ray by Peter Knoppers.)
Take six figure 8 pieces and two figure 3 pieces:

Insert each piece of type 3 into three pieces of type 8 (but leave them one unit away from the center):

Build a sub-assembly consisting of two pieces of type 3 and one piece of type 8:

Slide the new sub-assembly over the four outermost figure 8 pieces of the assembly that you built before.

Slide two pieces of type 3 one unit in to lock the sub-assembly in place:

Get two more pieces of type 8:

Slide each one over the outermost, standing pieces of type 8:

Get two more pieces of type 3:

Slide them into the top holes of the standing figure 8 pieces (but not quite to the center):

Use the remaining pieces to make another sub-assembly like before:

Slide the sub-assembly over the outermost standing pieces of type 8:

Lock the sub-assembly in place by sliding the figure 3 pieces in:

That's it.

## How to take it apart

It can be a little bit difficult to find the first move. You'll have to identify a pair of type 3 pieces with the gaps facing outward that can slide in the same direction. These must be moved one unit (not two) to unlock a sub-assembly.