I was going through ebay recently and started thinking about the differences between Mega-Drive manuals. The common one (and one I remember as a kid) is the foldout one with blue pictures and writing. But I also have a few of the full colour glossy ones. I figured this was just a case of each game manufacturer using different manuals, but I recently saw a copy of Batman Returns with the foldout type, whereas mine is the glossy type. Does anyone know the history behind this? Or could even point me to somewhere that talks about this? I find it interesting that the same game could have been released with both type of manual.
Also are any of them considered harder to find, and therefore worth more?