If you like the Sonic Unleashed demo for Xbox 360, then you will certainly buy its full version, otherwise not. Everybody knows that demos boost sales and people buys games more often if they like the demo version of the game. So if gamers likes Sonic Unleashed XBox 360 demo, then they will also buy its full version. Soon Sonic Unleashed demo will be releasing for PlayStation 3 also. For Xbox 360 demo of the game, download it directly in your Xbox 360 from XBox Live Marketplace.