Super Smash Bros. on Wii U will undoubtedly be the best-looking version of the game, but there’s a new feature that the 3DS version will be the only one to offer. In his latest Miiverse post, director Masahiro Sakurai revealed an option that effectively turns your 3DS into a portable music player for the game’s soundtrack.

The game allows you to freely play any of its music and character voices when the system is open. By enabling the Play in Sleep Mode option, you can close the 3DS and continue to listen to all of this using headphones. You can even navigate through tracks with the system closed by using the L and R shoulder buttons. Some fairly standard music player options–like shuffle and loop–are available, too.

This feature will presumably be of less use to those with a 2DS, which doesn’t fold shut, but those people will still be able to freely listen to the game’s soundtrack.

To get a taste of what the new Smash Bros.’s soundtrack will be like, you can check out a selection of its music on the game’s official website.

The 3DS version of Super Smash Bros. launches on October 3, with the Wii U version following sometime this holiday–something we recently learned is due to the intense amount of testing required. The two versions do feature some differences beyond the graphics and Play in Sleep Mode: there’s the 3DS-exclusive Smash Run mode, a way to buy trophies in the 3DS version, and levels and trophies that are only available in one version or the other.