Slot machines may differ from each other in so many different ways.

They may differ by the number of lines a slot machine has. A slot machine may have between one and five line slots.

They may differ by the number of reels each slot machine may have. While some slot machines have three reels, others may have up to six reel slots.

Then there are Classic (physical world slot machines) or Video Slots (virtual slot machines).

There are straight slots and progressive slots.

There are free play or real money slots.

Furthermore, slot machines come in so many different themes, colors and designs.