The Heart of Vegas game does not support promo codes and is in no way affiliated with any program or website that offers these codes.
Also please be aware of any unofficial Heart of Vegas sites that my ask you to partake in surveys as well as ask you to download any kind of software for the promise of free coins. We will never ask you to install anything which is not related to running the games. We are actively working with Facebook to tackle these kinds of sites.
The best place to find bonus coins is on our official Facebook page located here; https://www.facebook.com/HeartofVegas/ by participating in community posted events.