train tracks?

Could someone please tell me how to figure out which color is first?? I've spent an hour trying to figure this out, and SG isn't any help for me. Would a kind hearted fishie please help a lowly starfish?? I'll give you a fin when I grow one! Thanks in advance.

Are you talking about the slider puzzle? You do them each separately, and I didn't do them in any particular order.

One color ist lit - you have to do that color - each color is a separate puzzle part.

Purple is first. Light blue is second. Yellow is last.