There's 9 so far.

-Super Monkey Ball 1 and 2 for the GameCube

-Super Monkey Ball Deluxe for the PlayStation/Xbox

-Super Monkey Ball Jr. for Gameboy

-Super Monkey Ball Adventure

-Super Monkey Ball Touch and Roll for the DS

-Super Monkey Ball Banana Blitz for Wii

-Super Monkey Ball Step and Roll for Wii

-Super Monkey Ball 3D for 3DS

Super Monkey Ball Deluxe happened in 2005.

No, Super Monkey Ball 3 was never released an any part of the world. It could be that Sega needed more money to make another Sonic game. It's rumored that some stages and ideas from Super Monkey Ball 3 were put in to Super Monkey Ball Deluxe(which I have and play) and I think might be right.

Super Monkey Ball Deluxe(which is Super Monkey Ball and Super Monkey Ball 2 combined with a few new stages and other stuff) is as close as you can get to playing Super Monkey Ball 3...yes I wanted it to...

-Neweegee

10

Super Monkey Ball Adventure happened in 2006.