Siliconera: After completing Kingdom Hearts: Birth By Sleep, Square Enix’s Osaka studio refined the Deck Command system again for Kingdom Hearts 3D [Dream Drop Distance]. Flowmotion was a major addition, which lets Sora and Riku utilize the environment to do special attacks. You can swing on lamp posts or dive into enemies after sliding on a grind rail.
Instead of letting players switch between Sora and Riku at save points, the Drop mechanic automatically changes characters when time runs out. Tai Yasue, director of Kingdom Hearts 3D [Dream Drop Distance], talked about these changes and the growing series mythology during an interview with Siliconera.