: Platforms like RGC (Ranked Gaming Client) and ENT Gaming developed server-side checks to see if a player’s client was "clicking" on units it shouldn't be able to see.

Some map creators placed "illegal" 3D models in unviewable corners of the map. If a maphack removed the fog, these models would render and instantly crash the hacker’s client.

Advanced hacks didn't just show the map; they offered "Click Detection." In Warcraft III, when you clicked an enemy unit in the Fog of War, the game would still register the selection in the engine’s underlying state. Maphacks would intercept these signals and ping the map, alerting the cheater that "Pudge is currently at the Roshan pit." The Evolution of Detection and Anticheats