Holy crap this thread reminded me of one of my favorite childhood games, Wrecking Crew. I haven't thought about this game at all since I was little. I completely forgot about it until watching a youtube vid hit me like a ton of nostalgia bricks. I loved the game. Can't believe I haven't ran into it again until now. Definitely going to have to hunt down a cart.
As for the Balloon Fight/Kid games, I've always been more of a Joust fan, but I think that's because it's what I remember playing when I was younger. I might have to get the Balloon games to give them a shot.
I love both Joust and Balloon Fight, but have have never owned a Balloon Fight cart, I have played the mess out of it on other platforms. Thats it, time to hunt down both Balloon Fight and Mario Bros carts now.