Super Monkey Ball 3D (U) (スーパーモンキーボール3D U) is a popular Nintendo 3DS game developed by SEGA and released in 2011. It is the fourth installment in the Super Monkey Ball series and the first 3D game in the series. In this game, you take control of one of four monkeys, each with their own unique abilities, and navigate through various obstacle-filled levels. The game features over 150 stages, with increasing difficulty as you progress. There are also several mini-games, such as bowling and golf, that provide a break from the main game. In addition, the game features StreetPass functionality, allowing you to compete against other 3DS owners in mini-games. Super Monkey Ball 3D (U) is an enjoyable and challenging game that will keep you entertained for hours.