Especially early in the game, Terrans have a difficult time against a Zerg rusher, but later on when both players hit the unit limit, the Terran player is advantageous.

- Make bunkers and put a ratio of 3 marines to one firebat in each bunker. Place bunkers around the perimeters of your town and also in places close to your SCVs.

- Later when the enemy has Mutalisks/Guardians, start making Missile Turrets to support your bunkers.

- Get Wraiths and Battlecruisers. Research Cloaking for the Wraith and Yamato Cannon for the Battlecruiser. The enemy needs overlords or sunken/spore colonies to spot cloaked wraiths. When they're on offense, their only choice are overlords. However, overlords are slow unless upgraded. Yamato gun is very effective since it can destroy just about any one of their units in one shot for 150 mana.

- If the enemy places their overlords in an unguarded place, nuclear strike them with a cloaked ghost and run away to make sure they don't know where the nuke is targeted. If that nuclear strike is successful, then try nuking their workers/expansions. They'll have a hard time rebuilding cuz they must rebuild their overlords first. Also, for every new building they build now, that one less worker they have until they rebuild the overlords.

- Watch out for Scourges. Wraiths can avoid them by cloaking the last minute before the Scourges hit it. Battlecruisers usually can kill a Scourge in 1 or 2 hits.