Hey, i have two questions. 1. can you make a co - op map or mod that has more than 2 players?
2. can you add self made gels to your map?
thanks, Redneck

I think there may be a setting in a file somewhere that you can change to allow more than two players. However, I don't know if the game would handle it; you might have to either just play with two or have the third manually connect. Not sure.

Second, I'm pretty sure all the gels are determined by code, which means unless VALVe at some point releases the source for Portal 2 (I wouldn't hold my breath) custom gels are pretty much out of the question.

However, you can cheat and make gels with physics models and triggers, reepblue did it a few months ago in portal 1. (And he also made Portable surface gel before it was announced.)