How do I get the monsters, players with emitters, objects, and pickups that are in the arena game and many other ones on SPLORE? I can't seem to edit Voxatron Arena for assets and whenever I go to designer there's only a pink block, a world, and a player without any emitters.

I asked this same question a while back! still not sure how to use them though, it was some kind of "internal" tab or something.

Was it that you couldn't edit them or couldn't see the assets? (I don't know where to look for the "Internal" tab.)

It was that you couldn't edit them. However, I was using Voxatron version 0.3.5b and there was some sort of update till' then. Hopefully this clears up some confusion!