In Puzzle #39 from the book, the challenge is to generate the repeating pattern rBBBrBBBrBBBrBBB, which is 3 blue (B) followed by 1 red ®, 3 blue, 1 red, repeating until the board runs out of marbles.

In this version, the challenge is the generate a similar pattern but with 4 blue followed by 1 red (repeating until out of marbles). It will look like rBBBBrBBBBrBBBBrBBBB,

Use the minimal number of parts and favor simple parts (ramps, bits, crossovers) over more “expensive” parts such as gears and gear bits.

I can provide a solution upon request.