PvT 3gate Robo

General Overview

This build gets an Observer for detection and a fast Mothership Core in order to play safe. It can then attack your opponent with a strong army or take an expansion and tech to Colossi.

Build Order

  • 9 – Pylon
  • 13 – Gateway
  • 15 – 1st Assimilator
  • 16 – Pylon
  • 18 – @100% Gateway, start Cybernetics Core and 2nd Assimilator
  • 23 – @100% Cybernetics Core, start 1st Stalker, Warpgate Research, and Pylon
  • 24 – @100 Gas, start Mothership Core
  • @100% 1st Stalker, start 2nd Stalker
  • @100 Gas, start Robotics Facility
  • @100% 2nd Stalker, start Sentry and 2 more Gateways
  • Benchmark: When your Robotics Facility finishes (@5:40ish), you should have 2 Stalkers, a Sentry, and around 24 Probes
  • @100% Robotics Facility, start Observer
  • @100% Observer, start Immortal and warp-in Gateway units


This build gets you a fast Mothership Core for defense with a reasonably timed Observer for detection, so scouting is quite minimal.  Use a scouting Probe to check that your opponent has all of their buildings in their base (and not proxying you), and check to see whether your opponent is producing Marines or a Reaper.


This build can transition into a macro build or an all-out attack.  If you want to attack with this build, then constantly produce Immortals after your first Observer and warp-in units 3 at a time.  Set up a proxy Pylon near your opponent’s base and attack while reinforcing with 3 Warpgate units at a time.

If you want to play a more macro style, then stop all army production after your first Immortal and start a Nexus, Forge, and then Robotics Bay in that order.  Going for Colossus production and Ground upgrades will set you up for a strong midgame.

Pros and Cons

This build is strong because it is so easy and safe to execute, and can transition very easily into a strong attack or a macro style of play.

However, this build gets a slower Nexus and thus economy than a 1gate FE build does.

Favorable Maps

This build is viable on every map.  However, it is best to transition into a Nexus on larger maps and attack with Immortals on smaller maps.

  • King Sejong Station
  • Overgrowth
  • Catallena
  • Merry Go Round
  • Deadwing
  • Foxtrot Labs
  • Nimbus


3gate Robo Tutorial Replay vs a Very Easy AI