Moving games between hard drives

My wife paid for a game, Dining Dash 2. I tried basic searches ( on the hard drive) and can only find 2 small dat files. Is this an on-line only game? I need to re-format the drive it is on, real soon. I not sure if moving will even work, I just can't find this game.

Thanks Ted

 

Here is the game's website. It looks like when you purchase the game they give you an unlock code, presumably by email, that allows you access to the full game. After you format the drive, just download the game from the website again and enter the code that your wife bought to unlock the full game.