LocoRoco Midnight Carnival is the last game in the LocoRoco series for the PlayStation Portable. The game is a spin-off that continues the story of LocoRoco 2 and features a new move called "Boing!". This was released for Halloween.
LocoRoco Midnight Carnival is based on a secret carnival-like base, created by the BuiBui, a red, mischievous version of the MuiMui. The title shows that the LocoRoco were quietly sleeping, while in the background, a BuiBui pulls on a nearby star (cleverly designed to just look like a star), opening a trapdoor under the LocoRoco, sending them into a chute, taking them into a cannon, which shows the LocoRoco "Boing!" power. The cannon sends the LocoRoco into the BuiBui's secret base, the midnight carnival.
Source: Wikipedia, "LocoRoco Midnight Carnival", available under the CC-BY-SA License.