Slot machines have been developed into all kinds of variations, especially since they went online. The classics though have turned out to be the one big evergreen in the business. No matter where you go, they're always there. It's clear that we couldn't do without them either! Here are the newest and best interpretations on an old and much beloved theme.

Among casino games, the slots are the most easily accessible, as they require little to no skill. That's made them incredibly popular. Most online casinos may feature 20-odd table and card games while making sure their selection of slots doesn't stay below at least 100. With today's technology, virtually anything can be turned into a slot.

The first machine was built by Californian Charles Fey in the late 1800s. The three-reel slot ran five symbols that will look familiar to almost anyone: Horseshoes, spades, diamonds, hearts and the Liberty Bell that gave the machine its now legendary name. Fey almost went out of business – his creation became popular so quickly he couldn't produce enough, and imitators started taking over. Saloons, cigar stores and barber shops soon all had their own.

Although the new generations of the game now account for almost 70% of casino sales, the classics remain oddly popular. The newest trend is to create Internet versions of machines that people know from their real-life originals. One of the best examples is Norway, where slots like Mega Joker and Jackpot 6000 are popular thanks to the fact that until the early 2000s over 19,000 machines were placed all around the country.