Super Monkey Ball Adventure was Sega's 3rd console entry to the series in 2006 on PS2 and Gamecube with an addition release for PSP. While the series was gaining decent popularity, Sega decided to hand the project off to Traveler's Tales which was quite the mistake.
While the rest of the series were collections of 3D puzzle stages of guiding your ball through the stage and through the goal post; instead you were given a more open world in this sequel. Which made up for most of the game's story mode. The series's popular mini-games did have a role, but apparently not as large as before.
The game received mostly negative reviews, and those rants prevented me from buying the game to this day. I first thought that maybe this was the black sheep of the series, but after this Sega never seem to gain their thunder back. Oh well, I still have my memories.