The game should be called Portal 3: Return Of Chell. Chell would come back to the Enrichment Center and GLaDOS would think Chell and Wheatley, who fell out of space, were going to sabotage her. So, GLaDOS makes them do more tests, with new mechanics like maybe moving turrets.


EDIT: =[POTATOS]='s ideas are good, but the tnt turrets are scary as s**t.