its not the engine. the engine used for backbreaker game and GTA 4 is Euphoria not Endorphin :P
Endorphin - Physics Simulation program and animations
Euphoria - Physics game engine
Belt: 10th Dan ; Clan: JollyR
Orgs: ORMO, Portugal Organization and T3AL
I loved it, I made some epic stuff on it too, though, I stopped enjoying it due to the fact that when you make people run and stuff, they go grey and you can't manipulate them or something. Oh well.