Citizens Advice has called for OFT guidelines to back strong enforcement for online games that try to pressure players into making purchases.
The service said one man it helped had been landed with a £200 bill racked up on a game played by his 10-year-old son, and was told the only way to get his money back would be to sue the child.
The scandal of online games which try to pressure or trick players into making extra purchases must end.
We've seen parents turning to us after their children inadvertently run up huge bills for downloads, so we welcome the OFT's moves to clamp down on the practice.
More top news
Kate will join Prince William on a tour of the Stephen Lawrence Centre before visiting a charity working with disadvantaged young people.
There is an "urgent need" for a "simpler and more trusted" system for investigating clinical failures, according to a damning report.
Over 100 mothers and fathers were investigated for leaving their children unsupervised in the final three months of 2014, new figures find.