Board Thread:General Discussion/@comment-67.198.29.162-20121226210405/@comment-1313357-20121227020314

Cool12309 wrote: Only the iOS versions have the 4th upgrade for the buildings. In the normal and Deluxe versions, it only goes up to 3. It'd be nice if they included the 4th tier for the buildings..

I agree, since that is the version "Deluxe", for being the most expensive, the series BTD5.