Crystallis is a multiplayer map for StarCraft: Brood War. It supports two players.
Huge portions of the map are covered with a forest of low yield mineral patches (all patches have 48 units) which prevent early game harassment. Continuous mining is required not only to acquire vespene gas but to open a path to the opponent.
Terran players (and to a certain degree zerg since they need to build lots of hatcheries anyway) have an advantage regarding mining, since they can lift off their command center and move it whenever a batch of minerals is depleted.
Melee units are only useful when a lot of transporters are available or most of the minerals have been removed so the emphasis should be put on air and long ranged units (siege tanks).
Brood War Enlarged Map Images. StarCraft Compendium. Accessed on 2008-27-09