In the context of the original (a custom map for Warcraft III ), a Maphack (MH) was a third-party cheat designed to remove the "Fog of War." This gave players an unfair advantage by making all enemy units, structures, and movements visible on both the main screen and the minimap. Key Features of Dota 1 Maphacks
Competitive communities (like Garena or ICCup ) would manually review replays. If a player’s camera moved to a location in the fog exactly where an enemy was, or if they clicked on a hero they shouldn't be able to see, they were banned for "map awareness" that was too perfect. 1 Maphack Dota 1
Allowed the user to click on enemy heroes in the fog to check their items, mana, and skill cooldowns. In the context of the original (a custom
Displayed which runes had spawned in the river and the status of neutral creep camps (including Roshan ) without having vision. How They Worked (Technically) Allowed the user to click on enemy heroes