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I am guessing you haven't played it or had a look at the puzzles because if you had you would see that co-op is required,
Thank you for your answer and have a good day!
1. Create a text file: solocoop.cfg with these contents:
2. Save the file solocoop.cfg to C:\Program Files (x86)\Steam\steamapps\common\Portal Reloaded\portalreloaded\cfg
3. Start the game and open the console (F10 by default)
4. Type exec solocoop and press enter.
5. You swap characters by pressing "C". Sometimes you need to press "C" twice after a level loads or after a robot dies. Have fun!
This description is based on the guide by LazyDog from here:
https://steamcommunity.com/sharedfiles/filedetails/?id=2558323045