The 23-year-old was leaving an Asda supermarket in Colindale, north London, in the early hours of Tuesday just 80 minutes after the latest instalment of the blockbusting game series went on sale.
(Also see: GTA V makes solid debut, is reportedly "worth the five-year wait")
"The victim had been shopping and was on his way home when he was hit with a brick. He was then stabbed and robbed," a Metropolitan Police spokesman told AFP.
"A copy of 'Grand Theft Auto V' (Review), a watch and a mobile phone were stolen."
The man was in a stable condition in hospital following the attack, the spokesman added.
The attacker or attackers remained at large.
Fans around the world have snapped up copies of "Grand Theft Auto V" following its release on Tuesday, with long queues in many countries in Asia and Europe and even a stampede at one shop in the Netherlands.
Rockstar Games spent five years crafting the title with a rumoured production budget of $270 million (202 million euros), dwarfing the outlay on some Hollywood films.
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