Thinking it through a bit more, I would consider a variation on this game, where you don’t have a list but a ring buffer. Then, you can replace the linear gutt

Thinking it through a bit more, I would consider a variation on this game, where you don’t have a list but a ring buffer. Then, you can replace the linear gutter by a circular one and replace the cylinders by parts of a torus. That would make for a cooler look of the game (on the other hand: how would you easily see you’ve completed the puzzle?) Unfortunately, you won’t be able to put the ‘spare’ parts in a concentric circle as that would have a different radius.