Visa, a credit-card firm, forecasts local consumers will spend less on non-games entertainment.

ECONOMIST: The culture industry will struggle during the Olympics

The spending watchdog also said issues related to cutting journeys on buses and the London Underground by non-Games users by an average of 13% a day - rising to 30% on peak days - still had to be resolved.

BBC: London 2012 at risk of exceeding budget, watchdog warns

Branded social games have the potential to generate higher average revenue per user than non-branded games, saysRavi Mehta, vice president of product at Viximo, a virtual goods company.

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