I'm very puzzled about level 8, based on what you've said. Certainly to be a good pedagogical tool, I'd want to see a system that very visibly showed a wider an

I'm very puzzled about level 8, based on what you've said. Certainly to be a good pedagogical tool, I'd want to see a system that very visibly showed a wider and wider diffraction pattern for longer wavelengths (as you've said). [The one advantage of a bounce that I was able to think of while playing was that it might wind up giving a cleaner "plane wave" input, but I'm not even sure that that's an advantage. Now that you mention it, though, perhaps there is some ideal speed for which bouncing off the back and side walls would result in propagation at an angle, so that a meaningful fraction of the probability density would hit the targets in as a central interference maximum.] If I were you, I'd leave out the discussion of decoherence entirely. It's a subtle topic (evanb did it justice, I think), and I'm reasonably convinced that it doesn't really apply to the game. (Even if I might be wrong about that, is that tidbit of background info important enough to your discussion to be worth the effort and/or the risk?) Thanks for a fun take on quantum stuff, regardless! (I don't know what's in the higher levels, but might be fun to see some more examples of things like tunneling through different barriers. And I wonder if there's any way of setting up resonance in a cavity in an interesting way...) Regarding credit: I don't feel like I've contributed that much at this point, but if you wind up with a moderate list of thank you's at some point, you're welcome to include "Steuard Jensen" on the list. [As for my comment not being more upvoted: I think I got some sort of black mark on my record here a few months ago after I tried to insist that recent reports about reactionless propulsion systems are very unlikely to pan out. Ever since then, I've gotten the sense that my comments are showing up with an initial scoring penalty.]