Ever since the start it was claimed that Terrans can't rush. True to the word 1 Marine can even beat 1 Zergling. However in large numbers Marines can be the most lethal unit in the game. Costing only 50 minerals, they are far more cost efficient compared to that of Hydralisks and their range allows them to get rid of zerglings before they can deal any harm. Also I'd like to Thank Kazyras2 for Supplying the idea.

The build order below details the build order of the Terran marine rush, so far it hard to imagine how any Zerg player can survive such an onslaught. However a Protoss player going for reavers will easily disable the rush.

Early Build Order:
1) Start the game like any other game. Build your Supply Depot while building your 8th SCV.

2) When resource allows construct a Barracks. At the same time make sure your Command Center is constantly training SCVs. You will need them to support 4 Barracks shortly in the future.

3) As another 150 minerals is reached construct the second Barracks. Now construct a supply depot when 100 minerals is reached. When your first Barracks is complete, Start training Marines while getting SCV to build your 3rd Barracks.

4) As your second Barracks finishes, train a Marines. Now use that SCV to build a supply depot as soon 100 minerals is achieved.

5) By now all your Barracks should building building force Marines. When your 3rd Barracks in complete construct the 4th one. Start building a supply depot whenever your supplies is 6 less than the max, you never want hear the message: "Not enough supplies."

6) As your 4th Barracks is complete, you should able to just maintain will four in constant training. Now group every 12 Marines is a tight group and hotkey them. By now you will need 1 SCV constantly building Supply Depots and you would probably reached the maximum efficiency with your SCVs

7) At this rate, it would not take long before you have reached 36 Marines. Group them is 3 group and send them up using the Attack Move command.. now the fun begins.

Execution of the Marine rush:
With 36 Marines under your command and more constantly training at your Barracks the enemy is sure to fall. Zerg is no proper counters for Marines till they have Guardians or Defilers. However you still to beware as Zerg Players can produce very fast...

1) Always use the attack move command, this way your marines can target different units and will always use their range to their best advantage.

2) As your Marines are charging up.. build a refinery at Mainbase. At the same time make sure Marines a bring pumped out constantly.

3) When you Marines the enemy base destroy everything in site. The enemy will have nothing but Zerglings and Hydras or 1 or 2 Muts with nothing else. You should be able to take out the Zerg base and be still left with 15 or so Marines.. now just send in reinforcements.

4) You would be surprised how fast 36 Marines can level a base =)

Marine Rush variations:
The only way a Zerg player may survive your attack is by building 3 Hatcheries and pumping out hydras...  however no matter what their base with be Mutilated and their attack force destroyed. now the cost advantage of Marines becomes evident as even with 4 Barracks, one can still climb the Tech tree.

1) If your Attack was destroyed by Hydras or Sunken Colonies, build factory immediately. This may pause your from build Marines for a few seconds but soon you'll be pumping out Marines again.

2) If you can build Marines build them, it won't be long before you get 40+ Marines again.

3) As soon as Siege Mode and 2-3 tank are done send your whole attack force to the enemy. For the enemy to have survive attack, he could not of afforded to climb the techtree and so I3 Siege tanks in siege mode can spell doom for the Hydras.

Overview:
This strategy is a must to use against Zerg Players especially those who thinks they can rely on just the Zerg mutalisk. A average can using this tactics will be around about 10 minutes allowing you to get a lot of Rating is a short time.