A man has been rewarded with $20,000 (£15,500) after spotting a bug on Steam.
Artem Moskowsky, a security researcher, discovered that people were gaining access to free game downloads by their generating their own licence keys through the digital distribution platform.
Artem only came to find the fault when he was browsing the Steamworks partner portal, which allows game studios to give a key to competition winners or journalists to review a game.
However, a simply modification could allow hackers to create an unlimited number of codes for any single game on Steam.
Speaking to news outlet the Register, he explained: "I managed to bypass the verification of ownership of the game by changing only one parameter."
Artem's discovery led to Steam owners Valve presenting him with $15,000, plus a $5,000 bonus for spotting the bug.
They've since confirmed the problem has been fixed.