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Ultimate Guide to Online Slots: Best Games to Play in 2025
Thousands of online slots are available at legal US online casinos but not all of them offer the high RTP and popular features that make for a great experience
Online slots are the most popular form of gaming at real money online casinos. Many casino welcome bonuses focus their value on slot play for that reason, making it helpful to know which slots offer the best potential return on your money and time.
All online slots, like most , work the same in terms of the basics. Your bet triggers a random number generator, the result of which may or may not award a prize.
On apps like BetMGM Casino and Caesars Palace Online Casino, you'll find a lot of diversity beyond that essential framework. One of the first points of deviation is whether the game offers a jackpot, and if so, which type.
Jackpot Slots
In online slots, a jackpot is a special prize that typically has a significantly greater dollar value than the more common prizes in a game. For that reason, hits for these prizes are usually rare.
Within the scope of jackpot slots, there are fixed-value and progressive jackpots. Fixed-value jackpots maintain their value regardless of the timing of their win.
Progressive jackpots grow in value with each wager until someone wins them or they reach a preset cap. When they are claimed, they return to an original value and the process begins anew.
Other elements that make playing certain online slots unique experiences are gameplay features. Online casinos like Fanatics Casino have been creative with these components.
Some online slots contain retro gameplay, with a small number of paylines and very few, if any, special features. Other titles present numerous ways to potentially claim some winnings.
Bonus Buy
Numerous online casinos like FanDuel Casino offer slots that give players the choice to skip right into a slot's bonus round for an additional stake. You should be aware that activating the bonus round does not guarantee that you will win anything during that mini-game.
Gamble
A high number of slots offer players the chance to "double down" on a winning bet. With the Gamble feature, you can put winnings up for a shot at adding to their value.
Respins
Respins are additional plays of a slot that occur immediately and do not require an additional stake. Respins at casinos like DraftKings Casino may require a minimum bet.
Scatters
Scatters are symbols that have intrinsic bonus effects regardless of where they land on the reels in an online slot. In many games, these symbols can trigger bonus rounds.
Wilds
Wild symbols replace other symbols and potentially form paylines. In some slots, these symbols have additional effects, like staying in place on the reels for subsequent plays or expanding to occupy additional spaces on the reels.
Combined with a trove of various themes, the libraries of online slots on apps like Golden Nugget Casino accommodate nearly any preferences. Many players include a high RTP in those preferences.
Highest-RTP slots at US online casinos
RTP, or return to player, is an important statistic for online slots. It is the portion of all the money wagered on a game that the casino returns to players over time.
Among legal online casinos in the US, 96% is a standard RTP for slots. That means that for every $100 bet on the slot, it returns $96.
Players should not confuse a high RTP with a high likelihood of winning. Slots are solely based on chance.
A slot with a low RTP may yield substantial winnings, while a slot with a higher RTP may yield no results at all. Regardless, many people prefer higher RTP slots because the pot of money they have a chance to win a portion of is larger.
Slot RTP can vary with time and based on the jurisdiction in which you play the game. Some slots that are famous for a higher than average RTP, though, are:
Blood Suckers
Book of 99
Codex of Fortune
Mighty Black Knight
White Rabbit
All of these games are available on at least one licensed online casino app in Michigan, New Jersey, Pennsylvania, and West Virginia as of October 2025. Availability is subject to change.
The best legal online casinos for players in MI, NJ, PA, and WV have earned that distinction through the quality and size of their slot libraries. BetMGM Casino, for example, has over 2,000 slots to choose from, while Caesars Palace nearly matches that with more than 1,900.
Fanatics and FanDuel are both stellar choices in terms of accessing slots you can't find anywhere else. At DraftKings and Golden Nugget, you'll find a strong selection of titles with access to rapidly growing progressive jackpots.
Across all of these online casino apps, hundreds if not thousands of online slots are ready to amuse and deliver chances at winnings. The choices of which games to play and how much to wager are yours.
