Dota 1 maphacking taught a generation of gamers about "game sense." Ironically, because hacks were so common, top-tier players had to develop an almost psychic ability to predict ganks just to keep up with potential cheaters.

It would change a conditional jump (if fog is on, don't draw model) to a "no-operation" (NOP) instruction, forcing the game to draw every model on the map regardless of vision. 3. The "Click Detection" Feature

For a player using MH, the entire map is visible. They can see: Enemy heroes jungling or ganking.