Hmm. That would have been pretty cool, too - particularly if you could do either the one player with switching, _or_ two player. The idea is great, but there wasn't enough use of the differences between characters for most of the puzzles, and between Billy's inability to mix things, the way Rebecca took damage, and the really, really irritating item system, I found myself getting a little frustrated. I do hope they refine it and use it again in a later game, though, because the potential for awesomeness was there.