Web game extras face Office of Fair Trading scrutiny
12 April 2013 Last updated at 14:28 BST
Web and phone games aimed at children that charge for extras are being investigated by the Office of Fair Trading.
The OFT wants to find out if the games put undue pressure on children to pay for additional content.
Many games ask players to pay to get coins, gems or other virtual items to speed their progress through levels.
Rory Cellan-Jones reports.