Leah looks into the new ban
Selling a gadget which lets you copy games to use on the Nintendo DS is against the law, a top court has ruled.
Loads of people download DS games for free - which is illegal - then play them using special cartridges.
The gadget gets round security systems built in to the official Nintendo games so you don't have to cough up cash to get the latest releases.
But the High Court ruling means the cartridges can no longer be sold or advertised in the UK.
Nintendo says it's not fair that people are able to play their games without paying for them.
Gaming expert Zoe Kleinman explains the ban
But the people who make the copiers say they're not doing anything wrong and that the cartridges are meant for people who want to make their own home-made games.
Tech expert Zoe Kleinman told Leah and Ore that the move means you won't be able to buy the copiers, sell them or see adverts for them.
But if you've got one don't worry, Nintendo's unlikely to come after you.