Progressive Slots
The second type of machines is called Progressive Slots. The slots keeps increasing each time a coin is played. When the jackpot finally hits, the amount goes back to the starting number.
These Slots too have a standard set of payoffs listed on the machine itself, but in addition, and what sometimes makes for some exciting play, is the big jackpot which progressively gets larger and larger, as every coin is put in. the jackpot total is posted above the machine and can grow to enormous sums of money.
Tips
More winning rows does not necessarily equate to better odds of winning, this just means more coins per play and therefore more possibilities of a payoff if each coin gives you another bar or direction it pays. The odds are built into the machine and no amount of lines played will change them.