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Five highest RTP slots you can play right now

Book of 99 leads this week's best RTP slots with 99% payback. See four other games on my list offering 98% RTP or higher, plus find out where to play them.

ByJeremy Olson·Updated: Oct 10, 2026 11:35AM ET·5 min read

With legal online casinos, players want to play slots with the best payout rates; one way to find that is by uncovering the highest RTP slots this week. It's important to look beyond just the max win potential or entertaining graphics. As required by each state with licensed online casinos, all of these slots feature verifiable RTP data from licensed and legit game developers. On top of that, they are available to play in multiple states with legal iGaming. 

This week's list of the best RTP online slots features five titles, which I've verified are available at one or more regulated online casinos. The following high-payback slot picks have at least 98% RTP or higher, making them some of the industry's best-paying games.

You'll find links to three licensed online casinos that offer these games in the next section. But first, let me cover this week's best RTP slot machines.

The main reason to play this game is that it currently features the highest RTP in the U.S. market. With 99% payback, Book of 99 offers better long-term prospects than most table games. It's also worth considering if you like the popular "book of" style slots. Our highest RTP slot guide shows which games beyond my top 5 list come closest to matching Book of 99's excellent payback.

Top alternative in another state: Legacy of Dead (96.55%). There's a pretty wide gap between Book of 99 and the next high-paying book-of slot. According to my research, Legacy of Dead is your next best option at licensed casino apps.

You can pump this game's RTP to 98.14% through Big Bet mode, which requires a $20 minimum for five spins. The drawback is that you're forced to wager $4 per spin to achieve the highest payback, but the upside is that Double Height scatters are unlocked.

Top alternative in another state: Medusa Megaways (97.63% RTP). If you're willing to bet more for higher RTP, Medusa Megaways is another game with this setup. You use the Buy Pass option to boost payback from 96.28% to 97.63%.

Featuring wins up to 10,000x the bet, Marching Legions offers an interesting combo of high RTP (98.12%) and explosive wins. However, the trade-off is that this game has high volatility, which can create brutal short-term stretches. 

Top alternative available in another state: Codex of Fortune (98% RTP). Codex of Fortune also combines high payback with the same impressive win potential at 10,000x.

Just like Golden Chief, this is another Barcrest slot with the Big Bet mode. Enabling the $20 minimum Big Bet over five spins unlocks 98.11% RTP and the Dr Jekyll Trail feature. The Dr Jekyll Goes Wild max win is only 500x. If you're looking for bigger win potential, our best paying slots guide covers games with up to 300,000x prizes.

Top alternative available in another state: Gorilla Go Wilder (97.04% RTP). Much like Dr Jekyll Goes Wild, Gorilla Go Wilder heavily incorporates wild symbols into its features.

Covered in our best online slots guide, Blood Suckers boasts a 98% RTP as well as a 45% hit frequency that no doubt is appealing to users who look not only for consistent winds but also a stronger payout long-term. As is typical, the max payout isn't as high as many would prefer, though it still tops out at 1,014x the original wager.

Players looking for great alternative slots could also consider: Secrets of Atlantis (97.07%). Developed by NextGen, this high-paying game may be available when Blood Suckers and other NetEnt slots aren't.

Now that you know this week's highest RTP online slots, let's cover three licensed U.S. casino apps where you can play them. This best online casino guide provides an expanded view of the top regulated operators.

Offering over 4,000 slots in some states, BetMGM is a natural choice for finding the best RTP slot machines. It's one of the few casino apps offering Book of 99 right now. It also offers other high-payers like Marching Legions, Blood Suckers, and Gorilla Go Wilder. Use bonus code SPORTSLINECAS to get up to 1,000 bonus spins and more at BetMGM Casino:

DraftKings has the two Barcrest games on our list, Golden Chief and Dr Jekyll Goes Wild. It also features high RTP slots like Blood Suckers, Codex of Fortune, and Medusa II. Besides offering some of the highest-paying games, DraftKings also features free demos for most of the titles covered here. Click here to get 1,000 Flex Spins when you sign up for DraftKings Casino:

The highest-paying online slot in the U.S. right now is Book of 99, but I can only find it at BetMGM Casino. That said, join BetMGM with the SPORTSLINECAS promo code if you want to play Book of 99 and enjoy its 99% RTP. The SPORTSLINECAS code qualifies you for up to 1,000 bonus spins and opportunities to "Spin the Wheel" for more rewards.

Even though high RTP slots pay most bets back over time, they can still be subject to short-term volatility. Take advantage of responsible gambling tools like deposit limits and wagering limits at casino apps. If you or anybody you know has a gambling problem, contact the 1-800-GAMBLER helpline.

Also, you must be 21+ and physically located in a relevant state (e.g., Michigan) to play at BetMGM and other regulated online casinos.

Our editorial recommendations on the highest RTP slots for this week are based solely on payout percentages and are independent of commercial relationships.

Written by Jeremy Olson

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