Wow, that Challenge Dice puzzle is a seriously cool find. I'd never even heard of such a thing, but now I'm pretty impressed that you found one and that the only things wrong with it are that two color stickers fell off and the plastic case got brittle and cracked during its nearly 50 years of existence. People generally don't treat things like that very well, let alone hang on to them for half a century instead of just chucking them in the trash. I'm totally jealous right now. Are there modern reproductions of those things? I really want to play with one now.