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Is there a way to add a new map to the game without having it go in the add-on folder? Basically make the game think it's a stock map?

Yes, but it would be a bad practise to make a mod with. You should probably specify what your design goals and requirements for your mod are, because in most cases bypassing the addon system is going to be a very bad idea and there is likely a better solution out there .

I want to make a mod for the PS2, which as far as I know doesn't support the addon system but does support additional maps beyond the stock if added by bypassing the addon system.

Ah yeah, console mod, you should've mentioned that in the first place. If I recall correctly you'll need to do the following.

First get a replacement a complete mission.lvl munging for the game, once you have that you're mission scripts go in there. Then you'll also need to munge a replacement shell.lvl and either setup a script to execute that adds maps to the mission list like addme scripts do or directly add your maps to missionlist.lua.

After that you'll have to find a way to add your localization strings, either through creating a new core.lvl with them in or through creating a custom lvl with them in and loading that up somehow. And that should be all I think, good luck and have fun, I understand console modding can be quite finicky at times.

I can walk you through it. Post a message on the SWBF PSP discord so I remember