When it comes to the types of slot machines out there you would find well over 100 different versions of the game. Some of the most popular are 3 or 5 reel slots, multi line slot machines, bonus slot machines, and progressive slot machines.
When it comes to the number of reels on a slot machine the standard is 3 or 5 reels. Recently, some companies have begun to produce 7 reel slot machines. There are usually 3 or 4 horizontal rows across vertical reels displayed by the slot machine.
A slot machine can have 1 up to 100 pay lines. The most common pay-line found on all slot machines is the middle row and symbols lining up straight across. Many machines will give you the chopice to not only play all lines, but places multiple bets on each row. For, example if you play 3 credits per line you will win triple the amount you would normally win on that pay-line.