What's the best way to promote my new free marble physics game?

[BobBeatty]

https://play.google.com/store/apps/details?id=com.vinlab.marblemacrocosm

 

[Scott Kenyon]

Join some communities on Google Plus such as Android and Android Developers. Post the link to it and ask them to share it around if they like it since it's free. The best way is to put Samsung amounts of money into an ad campaign, however I feel this method is a good first step and a lot cheaper.