Skylanders: SuperChargers Racing for the Nintendo 3DS is a dedicated combat-racing title, distinct from the console version's adventure gameplay. It focuses on kart-style racing across land, sea, and sky, utilizing the 3DS IR sensor and included Portal of Power to scan toys. The game features five main tours, online/local multiplayer for up to 4 players, and custom vehicle upgrades. 
This video provides a look at the gameplay and features of Skylanders Superchargers Racing on the 3DS: