Hmmmm....
I'm sure this question has been asked before (perhaps many many times).
There are two versions: Official & Cracked.
There is a drop down offering to explain the versions, however it talks about "Online", "Offline", & "Cracked". (And of course, no mention of "Official"). Now I have a fairly decent working knowledge of the English language, but still can't seem to understand what version does what. I can only imagine what our poor foreign guests must go through to figure how which version to use.
As a suggestion, rather than responding to this post, perhaps a kind hearted mod could correct the informational spoiler to explain the two version choices; and then EVERYBODY could have the straight scoop.