Super Monkey Ball: Banana Blitz HD

The Casual Course (Replay of lvl1-10 of the main game) its not that hard on casual, and you are not fighting against the clock, so just pick any character you'd like and go through the course in your on time, it shouldn't take more than 3 or 3:30 minutes.

I recommend that you practice with your desired character to get the best time since you need to finish this course at least 36 times as noted by Logan Ryan Goss on the Life in the Fast Lane solution