This reduces the game from 15 GB to ~9 GB without performance loss.
Before downloading anything, it is crucial to understand the science of compression. Standard compression (like ZIP or RAR) can reduce a file size by 10-30%. To get a 15 GB game down to 200 MB, you are talking about a compression ratio of over 98%. Call Of Duty Black Ops 2 Highly Compressed 200mb
If you own the game legally (via Steam or Disk), you can create your own "highly compressed" version to fit on a USB stick. This reduces the game from 15 GB to
Even doing all that, you will never hit 200MB. Even doing all that, you will never hit 200MB