• Updated: May. 29, 2025, 3:08 p.m.
• |Published: May. 23, 2025, 5:00 p.m.

Online sweepstakes casinos continue to take the US by storm. These are exciting online gaming platforms that, in many ways, resemble real money casinos. They are legal across most of the country and offer many of the same types of games as their real-money counterparts.

Slots are the primary focus for all online sweepstakes casinos. Below, I highlight five fun and engaging sweeps slots to play Memorial Day weekend:

Boogie Boom

A screenshot of the Boogie Boom slot game.Booming GamesCrown Coins Casino offers more than 220 slot games. One of the more unique ones is Boogie Boom, a somewhat unconventional online slot game developed by Booming Games. It features an unusual 7-7-5-5-5-7-7 grid with an average return-to-player (RTP) rate of 95.70%.

This game may look confusing on the surface, but the rules are fairly straightforward. Players attempt to land matching symbols on the grid. With the Cluster Pays feature, wins can be earned as long as symbols are grouped together.

This game has several other fun bonus features, including cascading reels and a free spins round that can offer huge multipliers.

Mammoth Tundra

A screenshot of the Mammoth Tundra slot game.Booming GamesAnother extremely fun sweeps slot to play Memorial Day weekend is Mammoth Tundra. This is a five-reel slot game that features 10 paylines and an average RTP rate of 95.40%.

Mammoth Tundra is available to play at Real Prize, a sweeps casino known for offering a huge number of the highest RTP slots.

This is a standard five-reel slot game. The basic goal is to land matching symbols on paylines. Land three or more scatter symbols to trigger the bonus round. When this happens, players are given a certain amount of free spins with multipliers up for grabs.

Gates of Hades

A screenshot of the Gates of Hades slot game.Pragmatic PlayOne of the best online slot games launched by Pragmatic Play in recent years is called Gates of Hades. It’s a six-reel online slot with a 95.50% RTP rate and a max payout of 10,000x your wager.

Gates of Hades is available at McLuck and comes with many features that players enjoy. The ante bet is particularly interesting. This gives players the opportunity to pay an extra 25% on their wager to double their chances of triggering the bonus round.

Land four, five or six Hades symbols to trigger the bonus round. When this happens, players are given 15 free spins with a set payout of 3x, 5x or 100x your wager.

Gemstone Rush

A screenshot of the Gemstone Rush slot game.SpadegamingMega Bonanza offers its players a huge number of world-class slot games. One of the best is Gemstone Rush, a six-reel slot game from Spadegaming with an average RTP rate of 96.77%. It features a fun mining theme that looks great using a desktop computer or a smartphone.

Gemstone Rush is making big waves in the online casino industry, too. It is one of the top real money slots offered at several of the biggest online casino platforms in the country.

To earn wins, players have to land groups of four matching symbols on the grid. Landing four or more scatter symbols anywhere on the grid will trigger the bonus round. This gives players 10 free spins for four scatters and an additional five for each additional one.

Donny Dough

A screenshot of the Donny Dough slot game.Hacksaw GamingFans of five-reel slot games may want to consider heading over to Casino.Click to play Donny Dough. This game features 14 paylines with an average RTP rate of 96.23%. It was developed by Hacksaw Gaming and remains one of the company’s most popular slot titles.

The theme of this game is unique, as it’s set on a gameshow stage. Players will find many unique features, including two different bonus rounds. Both rounds give players 10 free spins, yet offer different payout opportunities.

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