Custom missions and Multiplayer maps

[Honibear]

When i click load there are custom missions. Anyone know how to get some of that missions? If yes please write link here. I want some multiplayer maps too, i often see there are people on maps like The simpsons. Thank you for help.

[Nuku]

EDIT: nvm, this map pack is already included

[Cowboy(UA)]

Contact me! I have many custom multiplayer maps. And one custom single game mission.

[Screwioly]

I loaded up chromeed (the level editor), and made a simple map to test the fire spread physics, but i can't find a place to put the compiled map, so the game can load it.