Andrew

I've solved it all now, but, being colour-blind, there were a number of levels where I had to ask my non-colour-blind colleagues for assistance. Two particular issues... - Seeing which...

The bad news is that everybody's colour-blindness is different. However, there are certainly things you can do to make it easier. Contrast is a real help. Different brightness helps. (I...

Although you'd need to take care to ensure that it didn't provide a single way to solve all the levels (e.g. via a "little bobby tables" attack).