Weights Ideas

I was thinking more into the physical aspect and thought these ideas could easily be changed to use weights and the weight of other people to play, for the Hot air balloon you could have to hold and drop different weights to move the balloon out of the way of obstacles this could be done on the balance board as it detects weight, could be done as your weight counts for nothing and have like various sand bags around the board that must be picked up to weight the virtual balloon to raise and lower it. for the slot cars you could basically do more weight means more speed, I'm pretty sure you could wire it up to scales or summing, these could be done as multiplayer as different weights would be needed to do certain things.