Of course, games have been broken well before this, but I'm not sure if it's through hacking or bug exploiting. Ratchet & Clank: A Crack in Time was a fantastic example there. The Leaderboards (before they were changed) were completely broken. "Fastest Playthrough. Top of the list: 00:00:15" - yeah, I'm sure he's fantastically skilled to finish the game in 15 seconds
