There's one part of the manual that cost me a couple of mistakes.

In step 1 it says, "The first light to press is one of the lights that reveal a unique colour when highlighted . And in step 2, it says, "The second light to press is one of the lights that show a unique colour .

I was barely able to notice subtle difference between those. All I suggest is that they underline the parts I've underlined in the manual. Otherwise, this is a very fun and challenging module.