Police in Corby carried out an operation to tackle the issue of adult video games being sold to children.
Three-quarters of the shops tested sold 18+ games to children under 18 during the test purchases, which were carried out under the Video Recordings Acts of 1984 and 2010.
Games sold to the youngsters included Splinter Cell Blacklist, Bioshock Infinite and Alien Colonial Marines, which are all certified 18+.
Sgt Jon Hodgson from the Corby Safer Community team said: “We completed test purchases for 18 certified video games at shops in Corby.
“It was disappointing that a number of premises sold without challenge.
“Managers from all the shops were spoken to and took the matter very seriously.
“They are all taking measures to ensure it doesn’t happen again.”