Check Out Super Smash Bros. 3DS Classic Mode Walkthrough
Super Smash Bros. 3DS came out in Japan earlier today on the Nintendo e-Shop and I was able to get my hands on a copy on my Japanese 3DS.
I immediately went to Classic Mode since I want to start unlocking trophies and characters. This mode is pretty much simple, you choose the paths you want to take and fight off whatever enemies come your way until you get to Master Hand.
Setting your difficulty on high will definitely be useful if you want to unlock things right away, I was surprised to see that I almost easily unlocked Falco, Nes and Dark Pit.