For some reason last week I decided to play Metroid Prime through again, since I hadn't completed it on anything other than < 80% complete, which means I hadn't even seen the second ending, let alone the third (for getting 100%.) I happily played that for hours on end, and really quite enjoyed playing throught it again, but after purchasing Lost Kingdoms II, for £15 on ebay, I started playing that instead, I enjoyed the first Lost Kingdoms and although it's not the greatest game ever made its not too bad.
Anyway after playing that for a few hours, my head and eyes hurt quite a bit, and I feel generally "out of it". I don't know what it is about the game, but there arent any particularly flashy light bits or anything like that, Metroid Prime is far worse for flashy lights. Perhaps it's because I haven't played it before and my brain isn't used to working... While playing the game I don't notice anything but as soon as I stop playing it I feel totally weird. I also feel the urge to play it, so perhaps there are subliminal messages in the game telling me to play it =)