The map size limit of 255x255 tiles has been breached - there are now map sizes that go way beyond what is normally possible! How about a nice 512x512 tile map? Or an even bigger one?
A whopping 1792x1792 size map.
Before you open the scn editor and start designing, please carefully read all about these ridiculous sized maps in this scenario design thread. You can download the new 512x512, 768x768 and 1024x1024 map sizes here.