M life has a companion app for the myVEGAS Facebook game. The app does not let you play the game on your mobile device, but it does let you see your current Level, Chip and Loyalty Point totals. The main feature, though, is that it allows you to scan special QR codes for free spins where you can win myVEGAS chips and rewards. The codes can be found on receipts and signs around MGM resorts in Las Vegas. There is also a dedicated VIVA myVEGAS Facebook page which occasionally posts new QR codes for more free spins.
The app is only available for iOS, but many people have requested an Android version, so hopefully that will be available soon.
Here is a picture of a receipt from MORE, the Buffet at the Luxor with a VIVA myVEGAS QR code.