The competition is based on the thought that making things fun to do is the easiest way to change people’s behaviour for the better. Be it for yourself, for the environment, or for something entirely different, the only thing that matters is that it’s change for the better.
Our contribution is called 'Battery Pinball' and is aimed at making it fun to return used batteries:

Can we get people to recycle batteries by making it fun?
We propose to rebuild a pinball machine to accept batteries, rather than coins, as credits to play the game. This could be an innovation that has a place in local arcades and shopping centers.
See all the 11 finalists here: thefuntheory.com