 The Battle for Middle @-@ earth II is a real @-@ time strategy game . Similar to its predecessor , the game requires that the player build a base with structures to produce units , gather resources , research upgrades , and provide defenses . Units are used to attack the enemy and defend the player 's base . Players win matches by eliminating all enemy unit producing structures . Unlike the first game , the player can build an unlimited number of structures anywhere on the map , allowing for more freedom in base building and unit production . Players can build walls to defend their base ; however , the walls can only be constructed within a certain proximity to the players fortress . They can also construct arrow and catapult towers on building plots around a fortress to provide defensive support and basic protection . Along with this , each factions ' fortress is uniquely equipped with a special power reached only by purchasing necessary upgrades . The game 's HUD , called the <unk> , shows the player 's hero units and their abilities , a mini @-@ map , and objectives . 
