You Can't, Chromebook is basically just a web browser that can download simple files on it, you cant download games unless they are on the google web store.
Not entirely true. You can download pretty much anything that can be downloaded on Linux, but ONLY if your chromebook supports linux.
you can!!! 1. type in on chrome how to get ravenfield on chromebook there should be a video made by chromeosmadesimple
if yours supports linux beta