The victim was targeted after he left an Asda store just an hour and 20 minutes after the game went on sale. He was hit with a brick, stabbed and stripped of his mobile phone, watch and his copy of Grand Theft Auto V during the attack on Princes Avenue in Colindale.
The victim had been shopping and was on his way home when he was hit with a brick.
He was then stabbed and robbed.
The man is recovering in hospital where he is said to be in a stable condition.
More top news
Scotland Yard confirm that two people arrested in connection with the attack on Westminster have been released with no further action
An appeal to support the family of murdered policeman Keith Palmer has reached more than £700,000 in two days.
PC Keith Palmer will be remembered permanently at the National Memorial Arboretum, Home Secretary Amber Rudd has said.