Please excuse what is clearly me doing a terrible job of playing with two controllers at once.
This is pretty much the same thing I did for the tutorial, but on a test run instead (plus some really small details like setting the music, which would otherwise be a boring Humming the Bassline)). It's actually pretty amazing how well this works - there's no friendly contact damage (I have absolutely no idea why... maybe there's a mission flag for that that's only enabled for "real" multiplayer missions?), and both players' tags count towards the total. The really funny part is that you can still tag over each other's graffiti like in graffiti wars, but once every mark in the tag has been hit (even if different ones are hit by different players), it's considered complete and you can't touch it anymore. The different characters' tags even work!
Nevermind the fact that the characters spawn on top of each other at the beginning - that's trivial to fix, but I left it in to kind of emphasize that this is just exploratory hacking.
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