A "small number" of Pokemon X & Y players have discovered a "game-breaking save bug" said to render the game unplayable, VentureBeat reports.
The bug is said to cause the game to freeze "when saving in the outside streets area of Lumiose City", forcing players to hard reset the Nintendo 3DS. Resetting the console doesn't appear to fix the issue, however, with the game alleged to freeze "immediately" after reloading the save.
A video of the glitch appeared on YouTube, with other players reporting the same bug on gamefaqs.com.
Nintendo has yet to respond to the claims, but a post on Reddit suggests that removing the Nintendo 3DS's SD card while the console is powered off, placing it back in and booting the game up may fix the issue.
Source: venturebeat.com, reddit.com, gamefaqs.com