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That's why Portal is divided in chambers, in your case each room should be considered a chamber, once you get the desired cube out it should save, or when you get into the 3 red buttons room with the cube.
Try 'The Rube' http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=87384549
I'd be very happy if you could test and comment this one Descending
And you can always get another cube in same place.
Thanks! I fixed it. (placed a white wall so now you can get out of this situation)
p.s. How do I create checkpoints?
Got stuck in the pool with water, had no choice but to jump into it and restart, for my surprise I lost the cube I retrieved in the first room =/
Other than that, pretty fun map, though the laser room dodged Portal's purpose...