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
Expectant mother was mown down in the street as she tried to stop attempted fraudsters making a getaway.
A father has been found guilty of murdering his three-month-old son by hurling him "vigorously" against a hard surface in a fit of temper.
The self-styled revolutionary has spent the last 23 years in a high security prison for a string of murders and attacks.