Favorite: Crazy Bounce
 

Okay, this one looks simple enough. It's just a 10x10 board. How hard can that be? However, half the board is covered with bouncers. It can be completely solved without using any power-ups (e.g., hints or visible balls). However, to do that, you'll need to pay attention to timing. Here are several tips:

• Try to find the objects that are in the first square from the path's entrance or exit. If you are unsure if it's the first square, listen to other paths that have already been completed to get a feel for the timing.
• Listen to the rhythm. Equal intervals mean equal distances. For example, if you hear five bouncers hit and the time between each hit is the same, you then know they are all the same distance apart. If you can figure out this distance (e.g., a rapid hit may tell you that they are just one tile apart) and if you know the position of one of the bouncers, then you can find the rest.
• If you get stuck, go ahead and use the power-ups or, if you're feeling lucky, make a guess! After all, with half of the tiles holding a bouncer, your chances are pretty good. Right? :p

Have fun!

I tried it....
 

took a long time, can't remember my score, and I made a number of misses. Timing *is* important here, and I'm still trying to get the hang of knowing how long it takes the ball to go x number of tiles. It was fun, I'm going to try it again and post my results.
Oh and by the way, I did it regular mode, w/out using cheats...that's how I like to try most levels at least the first time through.

I finished it in 3:48 with 5 stars!

5:25 Mystery Balls - one accidental miss

2:48, 5 stars. I really enjoy levels like these - being able to combine sound and timing with logic is something I love about this game.