To "double your prizes" simply do this. When you get the CAVE bonus DO NOT GO INTO THE HOLE! Light up the letters C A V E again. Now when you go into the "cave" you will get double the prizes! (e.g. When you get the ball saver bonus it's 60 sec. instead of 30 sec.) I did this trick about 4 times and it easily got me 1st place on the score board! Especially when I got the BIG bonus! Woah!!