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.
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The vulnerable 64-year old was last seen in Hoxton at 10.45pm on Thursday 8 December.