Super Smash Bros. on the 3DS will feature a stage inspired by Nintendo's famous handheld, the Game Boy - AKA that "old DS" where you have to actually press buttons. Game director Masahiro Sakurai posted a picture of the stage to Miiverse earlier this week, noting that, "If you turn on the 3D effect, it really looks like there's a Game Boy inside the screen."
It's hard to tell exactly how the stage will function, but if we were to make a guess, we'd say it might behave similar to Flat Zone from Super Smash Bros. Melee. In that level - which is inspired by Game & Watch devices - players would have to battle one another as backgrounds changed to various Game & Watch games. Similar to the newly-unveiled Game Boy stage, Flat Zone featured walls around the stage designed to look like the edges of a handheld device.
Hopefully the experience doesn't get too authentic, or we'll find ourselves unable to play unless we have a bright light shining on our 3DS systems. Guess we'll find out on October 3.