Board Thread:Level Sharing and Reviewing/@comment-41.13.228.247-20140928185417/@comment-5645428-20141009080308

Well, as it goes, I would say to get from 10 map packs to 15 is a lot harder than getting from 0 to 10. You'll have beaten all the easier ones by that point, and from then on most packs will contain a level stupidly harder than the other two, preventing you from clearing the pack.

Now, if you're thinking about 20 packs, you're no average player.