Online slots offer players a chance to try out many different games without spending any money. Some are more complex than others, and some have bonus features that can award extra spins or even jackpots. The games are based on a combination of algorithms and random number generators to generate winning combinations. While these machines can be addictive, players are encouraged to take a break and use tools like reality checks and time outs to help them play responsibly.

Microgaming has an extensive range of free slot games that offer a variety of themes and paylines. These include a number of titles based on popular movies and TV shows, as well as classic titles like Cleopatra, Da Vinci Diamonds, and Siberian Storm. Some of the games feature special symbols and a multiplier bonus, while others have a Wheel Spin bonus, in which a bonus wheel awards cash prizes or access to other wheels that can award bigger prizes.

NetEnt is another huge player in the world of online slots, with titles including Starburst, Gonzo’s Quest, and Motorhead. They are known for their high-quality graphics, superior sound effects, and innovative bonus rounds. They also have a great selection of musical slots, including Guns N’ Roses and Jimi Hendrix.

WMS offers a unique mix of land based style games and innovative modern features in their slots. They also have a number of Megaways games that offer players huge wins on small bets. Their Raging Rhino Megaways slot game is a big hit with US players.

SG Interactive is another US developer of free slots with huge success stories including their Mega Moolah jackpot winner. Their slot games feature fun themes and innovative features, including stacked wilds and cascading wins. Their games are played on PCs, laptops, and mobile devices.

Play’n GO is another top provider of free slots, with hundreds of titles available at most operators. Their games have a high level of quality, with many featuring tumbling reels. They are also a favorite for fans of video poker and table games.

Pragmatic Play has a huge variety of online slots, including some incredibly popular ones like Sugar Rush and King Kong. The latter game offers 117,649 ways to win on the 5×5 grid, as well as a tumble and free spins feature. Look out for the Barrel Wild symbol and Sleepy Kong to score extra rewards. The title also has special firecracker and wheel symbols that can trigger a jackpot.