A group of parents in the United States have sued Apple saying they didn’t know their kids were spending good amount of money while playing games using Apple’s apps.

In the suit, the group of California parents, claimed that Apple made it achievable for children to constantly use ‘game currencies,’ which permit players of games and other apps accessible via Apple’s products to use real currency to purchase virtual coins and tools.

The suit claimed that the kids could ‘buy the currencies’ without their parent’s permission while playing game apps which Apple ‘advertised as free’

According to ABC News, the parents also claimed that the games and apps has been designed to be “highly addictive,” with a special reference to the Smurf Village app as a “bait-and-switch” type game which is available for free, but you need to pay 59 USD to buy 1,000 in-app credits.

Last year, Apple facilitated its users to buy a game currency up to 15 times without re-entering a password in the game.

The parents claim they didn’t know that purchases could be made without re-entering the password, which resulted in children charging the parent’s bank accounts in amounts ranging from 100 USD to 340 USD

According to the report, Apple resolved this issue in early 2011, but the parents claimed that it still makes it too simple for children to purchase without parents acknowledgement.