The thread about what machine to spend $100 a day on got me thinking.What was your favorite slot that disappeared from the casinos pretty quickly. For a brief time time about 10 years ago some casinos had Battleship, I could put $20 in that and play for hours. I would never win much but I wouldn't lose either. I think the fatal flaw from the casino standpoint was that the main bonus was you got to play battleship and it was an actual game of battleship that allowed you to think it through. It came up pretty often as well. Another great one was the original Flip Flop at the Venetian, that one would throw out bonus rounds pretty quickly and the payback was actually decent. It lasted maybe a little more than a year before getting pulled.