A man who cheated video game makers Nintendo out of approximately $12m (£7.46m) by selling unlicensed games online is facing jail.

Justin Success Brooks of Foxley Lane, Purley, sold thousands of counterfeit, unauthorised cartridges of popular games such as Mario and Sonic at the Olympics, for the Nintendo Wii, DS and DSi consoles.

The 41-year-old, who sold the illegal games online between 2009 and 2011, pleaded guilty to seven counts of fraud when he appeared at Croydon Crown Court last Friday.

It is estimated Brooks made in the region of £600,000 from the online sales.

An original game from a reputable retailer is priced between £30 and £40, but test purchases and web pages of Brooks' business showed he was supplying the cartridges, each of which contained up to 200 games on them, for between £39.95 and £89.95.

Brooks was caught after Nintendo raised concerns an online retailer was selling and distributing Nintendo products.

The video game company and the United Kingdom Interactive Entertainment association (UKIE) undertook purchases from a number of websites, and their investigation led them to Brooks.

He is charged with two counts of fraudulent trading, two counts of supplying an article to use in fraud, two counts of unauthorised possession of goods bearing a trademark and one count of unauthorised use of a trademark.

Judge Shani Barnes, granted unconditional bail pending a pre-sentence report, but told him: "This is clearly a serious matter and this is not giving any promise of anything other than custody if that is what the sentencing judge decides."

Brooks will be sentenced at Croydon Crown Court on November 9.