I've been playing for like 4 hours and I'm almost done single player aswell, and it seems like this game is A LOT more linear than the last one, in portal 1 you could make a portal on pretty much any wall/surface, in this one only certan walls, its like the puzzles are clear cut infront of you. So linear...
But I definitly want to try co-op with someone after I'm done single, hopefully it will be better.
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