I'm almost ashamed to admit this but I tried a bit of research on these ************ things. I played 1c at a time (i.e. one reel on a 1c machine) on the Egyptian Pyramid thing, Queen of the Nile. What I was trying to see was if there was any way at all that one could predict approximately when the free spins gimmick came up i.e. would it be a reasonable gamble to sit there in the pokie palace and press the buttons 250 times @ 1c and if no free spins had been gained to then up the ante. The range varied from somewhere in the 100s to about 500. I only, however, lasted about 3 hours or so and probably did about $10. I came to the conclusion that no amount of money is worth subjecting oneself to such mind numbing, energy sapping boredom.