One of the side game modes in Super Smash Bros. for 3DS is “StreetSmash”. This is a mode where you control a character token and try to knock other tokens off the map.
Enemy tokens are gathered using StreetPass and will move automatically, trying to knock each other (and you) off the map. You control your token using the Circle Pad. Tilting it in a direction lightly moves slowly, while pressing harder moves you faster.
As you bump into other tokens, you’ll build up damage on both your token and on the enemy’s. Once you’ve built up enough damage on their token, you’ll be able to launch them off the map by bumping into them.
More details on StreetSmash can be found here. Look out for Siliconera’s playtest of Super Smash Bros. for Nintendo 3DS later this week.