Board Thread:Questions and Answers/@comment-24185163-20131118234228/@comment-24150076-20131119041518

I think they mean "free" in the real-world money sense. The Wubbox is purchased with coins, so you can earn enough in-game without shelling out real cash. Many other games have items you can only purchase with premium currency (like gems), and that's where they are saying they are different.