Hi Rob.

Well, it is built using the JGJ 2 engine. But has different game objectives, new graphics, new sounds and totally different level design. JGJ 1.2 (the last released version) doesn't have stackable crates, or elevators. JGJ 2 didn't allow for slopes due to some bugs. So I removed that and all of the AIs from JGJ, and you get GTA Jump. In GTA Jump it is all about car part matching.

So is a game build on the Unreal Tournament game engine, really just Unreal? I don't know.