Terran Tips

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Massive Marine/Firebat attack:

When attacking from the ground you should do a massive marine/firebat swarm.  If you decide to go with marines research the range for the marines (U-238 Shells), and research stim packs.  If you go with firebats, just research stim packs.  If you come along cloaked or burrowed units such as lurkers, dark templars, etc. use scan from your comsat or bring a couple science vessels along.

 

Protoss

Zerg

General

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Defending with Siege Tanks vs. a large group of troops:

When your enemy attacks from ground you should have lots of siege tanks (siege mode) for defense.  It works very effectively against large groups of troops because it inflicts 85 damage (if upgraded) and has a very big splash damage.

Dropping guys to slow their mining rate:

When you do drops, fill your dropships with marines, firebats, medics, and scv's. Drop them in the middle of their mining area to kill their workers to slow them down on minerals and gas.  They will concentrate on getting more workers so it'll make them vulnerable for you to attack them.  If you can, use the scv's to build bunkers or turrets in their base.

Using Spider Mines to stop enemy attacks:

To stop their swarms use a lot of spider mines.  Spider mines do 125 damage and has a very large splash damage.  Each vulture has 3 spider mines so it shouldn't be so hard to deploy a lot of spider mines.  Just remember not to place them too close to each other.

Make your enemies braindead:

If you build supply depots to box yourself in, the enemy wont be able to get through to your defense.  Build bunkers behind the supply depots and when the enemy comes, they will just walk around outside your base until you kill them.  Also, to make your defense better, try putting tanks behind your bunkers and sieging them.  This trick works best against zerg and protoss if they rush since terran rushes mostly with marines that have long range.

Get defense early:

If you don't mind trapping yourself in, then try to build supply depots at the entrance and then building bunkers behind them.  If your opponents try to rush you, they'll have to get through your supply depots first while your marines are shooting them from your bunkers.  If your opponent(s) have a long shooting range then try to get tanks behind the bunkers.

Successful nukes:

Tired of losing your ghost right before he drops the nuke?  Then try to nuke across rivers or ridges.  People sometimes build all the way to the side where you can drop a nuke on them.

Annoying attacks:

Sometimes people build close to rivers or ridges.  Just put tanks on the other side of that river or ridge to stall your opponent.

Killing air units easily:

Tired of fly-by shootings?  You opponent may send some air units to attack you, but you can't attack them because they have better range.  Just build goliaths and upgrade their range at the machine shop.  Their range will increase to the range of guardians allowing you to attack air units with great attack range.  For best performance, upgrade their weapons so instead of doing 20 damage they'll do 32 damage.