Also, in the link, second row right, you will find a picture of the Fox Hound. This was an advantage play too. And the play carried no cost to spin it off. It was 100% profit.
Notice, on the panel below the reels, that the credit and play buttons are lit. This means there are credits on the machine. Notice that the big button in the center of the panel is not lit. When you trigger the bonus round (about every 60 spins or so)that big button in the center will light up. You have to hit that button in order to get into the bonus round.
Sometimes, when I would be making laps around the Vision machines looking for advantage plays, I would see that big button on a Fox Hound was lit up. None of the other buttons would be lit. What does that mean?
It means that a tourist bet his/her last credits and triggered the bonus round, but didn't notice it and walked off. So all I had to do was hit the button and it was free money.
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> http://www.lbslot.com/slot-machines/used-slot-machines.php?cat=1&catname=use-slot-machine&subcat=29&subcatname=IGT+S2000+Vision
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