You are Terran. You build a secret Academy in the corner of your base to go for a Ghost rush. The Zerg opponent, without an Overlord anywhere near you, builds a Spore Crawler in their main at 3:45. They have no scan, no scouting drone. They just knew .
Knowing exactly where an opponent spawned without scouting. starcraft remastered maphack
The sophistication of these tools varies based on how they interact with the game: You are Terran