(AI not recommended) This planet has a very low supply of vespene gas. Think you can overcome your opponents without access to it?
Change Log
This version of the map doesn't have vespene geysers at the starting locations, so players are forced to fight for the one in the middle, so they're able to expand to the islands with gas later (the island geysers are depleted to keep the struggle for the center going). Terrains can just fly their Command Centers to the islands though.