You can create level design in Unreal Engine and have it look more impressive and have the same functions as maps in Jedi Knight - but you won't be able to run the game Jedi Academy on that engine, even if you tried porting over gameplay or something like that. What Movie battles III are doing is more like making a different game apart from Jedi Knight altogether, which of course means a lot of work and re-creating assets, gameplay, animations and levels etc. So if you want to modify this game, it has to be a modification for this game on this engine If you want to carry over gameplay, animations etc to UDK... legal issues set aside, that would not be a realistic approach, and would probably surpass the ambition of all or most other projects that already have several team members on JKhub. With all that said, there is still very much you can do with Jedi Academy, and with the in-progress rend2 renderer, it will be possible to make it look many times more impressive than before. Some examples: http://jkhub.org/topic/2804-rd-rend2/?p=52656 http://jkhub.org/topic/1120-moonbase-labs/?p=51424