In any level, you can choose to change to a spikey or bouncy ball that will reduce or increase the amount you bounce after crashing into a wall. To change your ball, hold down the 1 and 2 buttons on your WiiMote and then press up or down on the D-pad.
Unlocking Time Attack mode on the Main Menu
In order to open up the Time Attack mode on the Main Menu, you must complete all 30 mazes in the main game. You don't have to do all the challenges for this.