Well, it's taken me a while, but i've finally finished the in-game editor! You now have the ability to create, save, load and test levels.
^The in-game editor^
There are 5 new levels, which are also saved as examples to edit. I've also fixed the bug where you crash if you don't put RT3D Resources in PSP/GAME. If you forget, you won't be able to save or hear sounds.
So, try it out and tell me what you think.
P.S. Copy the Main EBOOT folders into PSP/GAME, and copy the RT3DResources folder into PSP/GAME also, do not take all the files out of the folder, just copy the whole folder into PSP/GAME.