Alternate Reality Movies

These are movies with alternate reality themes and dreamworlds questioning the nature of reality. I have kept out movies with obvious dream sequences or where the nature of reality is a minor part of the whole movie... Let me know any good ones I have missed from the list.
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1.
eXistenZ (1999)
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
A game designer on the run from assassins must play her latest virtual reality creation with a marketing trainee to determine if the game has been damaged. (97 mins.)
 
2.
The Thirteenth Floor (1999)
    1 2 3 4 5 6 7 8 9 10 7.0/10 X  
Computer scientist Hannon Fuller has discovered something extremely important. He's about to tell the discovery to his colleague... (100 mins.)
Director: Josef Rusnak
 
3.
Inception (2010)
    1 2 3 4 5 6 7 8 9 10 8.8/10 X  
A thief, who steals corporate secrets through use of dream-sharing technology, is given the inverse task of planting an idea into the mind of a CEO. (148 mins.)
 
4.
Vanilla Sky (2001)
    1 2 3 4 5 6 7 8 9 10 6.9/10 X  
A self-indulgent and vain publishing magnate finds his privileged life upended after a vehicular accident with a resentful lover. (136 mins.)
Director: Cameron Crowe
 
5.
The Matrix (1999)
    1 2 3 4 5 6 7 8 9 10 8.7/10 X  
A computer hacker learns from mysterious rebels about the true nature of his reality and his role in the war against its controllers. (136 mins.)
 
6.
Paprika (2006)
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
When a machine that allows therapists to enter their patients' dreams is stolen, all Hell breaks loose. Only a young female therapist, Paprika, can stop it. (90 mins.)
Director: Satoshi Kon
 
7.
Dreamscape (1984)
    1 2 3 4 5 6 7 8 9 10 6.3/10 X  
A young psychic on the run from himself is recruited by a government agency experimenting with the use of the dream-sharing technology and is given the inverse task of planting an idea into the mind of the U.S. president. (99 mins.)
Director: Joseph Ruben
 
8.
Open Your Eyes (1997)
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
A very handsome man finds the love of his life, but he suffers an accident and needs to have his face rebuilt by surgery after it is severely disfigured. (117 mins.)
 
9.
Waking Life (2001)
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
A man shuffles through a dream meeting various people and discussing the meanings and purposes of the universe. (99 mins.)
 
10.
The Science of Sleep (2006)
    1 2 3 4 5 6 7 8 9 10 7.3/10 X  
A man entranced by his dreams and imagination is love-struck with a French woman and feels he can show her his world. (105 mins.)
Director: Michel Gondry
 
11.
Dark City (1998)
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
A man struggles with memories of his past, including a wife he cannot remember, in a nightmarish world with no sun. (100 mins.)
Director: Alex Proyas
 
12.
Eternal Sunshine of the Spotless Mind (2004)
    1 2 3 4 5 6 7 8 9 10 8.3/10 X  
When their relationship turns sour, a couple undergoes a procedure to have each other erased from their memories. But it is only through the process of loss that they discover what they had to begin with. (108 mins.)
Director: Michel Gondry
 
13.
Last Year at Marienbad (1961)
    1 2 3 4 5 6 7 8 9 10 7.9/10 X  
In a strange and isolated chateau, a man becomes acquainted with a woman and insists that they have met before. (94 mins.)
Director: Alain Resnais