Zookeeper

Contains a little-known free game feature. The free game icon pops up on one of the platforms on the
3rd screen (coconuts). It comes out like one of the bonuses, but instead it says "Free Game" in a little box. When it appears, it has it's own little tune too (and it usually pops up opposite of where you are, so if you are at the bottom of the screen, it will come out at the top). If you have a Zookeeper, go into options and set the "Free Game Rate" to 99 to make it appear more frequently. If it's set to 0, it won't come out at all. The Zookeeper Flyer actually has a note saying that the free game feature maybe prohibited in some states!