Take for example the 3rd skin in Challenge Mode Base:
Silver and Green blocks, you say? You do say that, right? Because I only know this after someone told me, having looked at the this screenshot. To me, it looks more like this:
The above two screenshots look just about the same to me, in terms of being able to recognize the different colored blocks. In photoshop, I took out all red and blue then grayscaled. I've always considered myself red/green color blind, but I guess this means I'm more just "green" color blind.
Anyway, when I get to this level, I die, quickly, because it turns the game into almost a random guessing game of where to match up colored blocks. So! Solution: I grab my red filter from my TV calibration kit, stick it in front of my eyes during this level, and it looks like this:
So, I kick ass on this level now :-) I can see "black" blocks vs "bright red" blocks now. I guess you could say I have to wear these "special glasses" in order to play Lumines Live!