How to remove factory arena:
delete the files:
FAC-1.mmp
FAC-1.SCR
FAC-2.mmp
FAC-2.SCR
FAC-3.mmp
FAC-3.SCR
FAC-4.mmp
FAC-4.SCR

For scripting idea's you can check the files:
FAC-1.mis
FAC-2.mis
FAC-3.mis
FAC-4.mis

The map features 1 to 4 players.
Buttons with all kinds of effects.
Cannons that attack with a button press.
A machine gun at the respawn-spots, at least one form of defence...
Pits of Fire(as long nothing is blocking its effect like a button effect working currectly).
A good button that causes explosions all over the map, trough, not quaranteed to hit a player.
And also traps, some that work when your at a certin place, some that work with a button.

Made by CarThief(thats my name in the GTA2 Game Hunter)