MISSION 3 Starcraft II Campaign Walk Through: ZERO HOURS Strategies

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MISSION 3: ZERO HOURS

Mission Objective:
a. Hold until extraction
b. Defend the base for 20 minutes

Credit rewards: 55,000

Game Overview: This mission starts with 16 Terran Marines and 5 SCVs. Marines are divided into 2 teams of 8 fighters, each team guarding each entry point to the base.

Starcraft 2 Key Strategies and Guide:

There are only two main entry points to the base. You need to tightly guard them by filling the bunker with marines. You must also ensure to have at least 2 medics around to keep your troops healthy.
Build more SCVs to ensure you have enough resources to train more units, which is vital in defending the base.
Have 1 SCV on standby near the bunker to immediately repair it when damaged.
Build anti-air turrets in front of the base (by the cliff side). There are some air enemy units among the forces that will attack your base.
Form at least 6 marines to scout the area and rescue some captives, which shall join your force once freed. Moreover, gather some vespene and mineral pallets along the sides of the road.
To effectively defend the base, train marines and firebots. Assign at least 45 units on each entry point.
Build at least 3 bunkers (in triangular position) in each entry point to the base.