Gamebreakers? Mu glitch, where some altcode letter crashed people out. Runecrafting glitch in dungeoneering. Noclip bug abuse. Penguins glitch giving players a lot of points. Dungeoneering experience glitch in all its forms. Still exists, I think. EDIT: Oh yes, there was also the climbing boots one. Not much of a bug but more along the lines of how they handled it by brushing off how people didn't hoard much of it.