I got really bored, and just decided to play this to kill some time. More challenging then normal spot the difference, as you get mirrored ones, and inverted, and ladybirds, and setances etc...
I've got upto blue level, and decided to stop to play PS2 instead...
Password for Blue level is "Fume" if you wanna miss the boring bits...
I hate the photo(real life) ones, find them the hardest.