I am on tthe final screen and need to complete the pipe network in order to reach the plate piece. I only have twenty tiles to clear and I can see them all on the screen, but they're all locked behind gates and I don't know how to open them. I've checkeed Roeland's excellent maps, but in this case they're not very helpful. Can someone nudge me in the right direction please?
Sorry I can't post a screenshot, but I don't know how to do that from a phone.