Pic of the day. For the 3DS version, you can select alternate tracks for stages by holding down the R Button while you select the stage–the brown drop shadow that frames the stage image when you hold down the R Button indicates the alternate track is active. For the Living Room stage, the alternate track is the vocal version of the default track. Songs with vocals aren’t the best match for battles, but the song was too good to leave out, so this is how we chose to include it.
Also, For the Boxing Ring, if you select the stage while holding down the L Button, you can play on the Smash Bros. version of the stage. If you hold down the Y Button, you can choose to play on the Punch Out! version. These variations are usually selected at random, but this method lets you select them manually.
— Sakurai (NNID: SakuraiMasahiroA)
…Wanna play? Buy a 3DS.
And if you’ve already got yours, click on Super Smash Bros. for Nintendo 3DS for everything you need to know about the game. 😀