I like the first two, and I can't wait to check out the other two! =) Thanks for sharing!
Can you explain how you use marshmallow shooters to review? It sounds like a fun time!
My only idea so far with the marshmallow shooters is to use a lid of plastic cups like in the Pong game but set it up vertically and they have to try to shoot a marshmallow into the cup to win points. But of course they can't shoot unless they get the problem right.