Atlas and p-body were doing tests until a mistake heppend and they get lost,they got to find a way back
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THE LAVA MATERIAL WAS NOT MADE BY ME
how to play it:
1.copy mp_coop_tractor_beam_test.bsp to portal2/portal2/maps
2.when you and your friend in game, type in console:
changelevel mp_coop_tractor_beam_test
Dont know how to enable console?
go to options
then keyboard/mouse
then enable the developer console (you will find a button)

also dont forget to put the materials folder into your portal2/portal2 folder

File Name: Lost.rar
File Size: 7.02 MiB
Click here to download Lost

Poor test :/

Dont try mading your personnal materials but you must trying have a better mapping than it

(sorry for poor english ^^)

Tested compatible with my map installer.

the initial idea may not have been bad but the execution needs a lot of work.