RTP (return on investment) is the primary indicator when it comes to online slot gaming; however, other factors, including hit frequency and volatility also play a large role in how much you win.

Low volatile slots offer more consistent wins while being less likely to trigger jackpots than their high-risk siblings, making them better suited for calculated risk takers.

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1. White Rabbit Megaways

RTP does not guarantee winnings, but playing slots with higher RTP rates can increase the odds of having a profitable session. This is especially true when using high-variance slots like Butterfly Staxx from Pragmatic Play with its immersive themes, vibrant colors, and feel-good soundtrack.

Big Time Gaming's White Rabbit Megaways slot reimagines Lewis Carroll's Alice in Wonderland for players, offering up to 248,832 ways of winning with each spin and featuring different symbols that offer various amounts of prize payouts - along with a sleepy caterpillar who can add bonus wilds.

Other symbols include royals that change into tea cups, clocks, Dodo birds, Tweedle Dee & Tweedle Dum, or Purple Cheshire Cats; as well as the Good Girl/Bad Girl feature that allows players to select either side of Alice for increased wins and frequent payouts.

2. Secrets of Atlantis

Experience Plato's sunken city of Atlantis through this fantasy underwater slot! Based on Plato's tale, this high RTP game boasts an immersive underwater setting featuring dark blue abysses with detailed depictions of Atlantis itself in the background, plus colorful gems, pearls, oyster shells, turtles and crabs trapped inside air bubbles, along with a stacked mermaid wild symbol that can sub for all other symbols.

This medium volatility game strikes an excellent balance between smaller wins and larger payouts, making it a good option for calculated risk-takers. Players can click the information icon for additional details on paylines, volatility and other aspects that affect game's odds of winning.

3. Jimi Hendrix

Jimi Hendrix was revered as a master of modern music for his soaring improvisation, rhythmic virtuosity and hallucinatory studio fantasias - hallmarks of greatness for any performer! His sound blended the bluesy sounds of Little Richard with rock 'n' roll drama onstage and aggressive performance from The Who, while developing into its own distinctive sound.

At your favorite sweepstake casinos, you can find high RTP slots to enjoy without making a deposit. Examples include Blood Suckers, Book of 99 and 1429 Uncharted Seas from Pragmatic Play which offer up to 5,000x win potential with bonus features like expanding wilds, re-spins and more!

4. Halloween Fortune

Big Time Gaming's Halloween Fortune slot game provides a thrillingly entertaining high RTP slot experience with medium volatility levels for maximum winning payouts and plenty of other bonus features and rounds to enjoy.

These features include wild respins, free spins mode, and the Witches Brew feature with its three bonus modes; all helping increase its relatively high RTP rate as well as contributing to its maximum payout of 10,000x.

A game's RTP rate is clearly displayed alongside each reel, along with information regarding its paylines, features and minimum and maximum bet amounts. This gives players a clear understanding of what they can expect from this slot and its long-term return value.

5. Butterfly Staxx

Butterfly Staxx is an engaging slot that boasts unique game mechanics. Beginning as unremarkable caterpillars, these elegant butterflies soon transform into striking symbols fluttering across the reels for a relaxing game play experience.

This NetEnt game boasts an alluring synthesizer-style backing track that is ideal for soothing an overworked gambler and relaxing them, as well as several special features like Re-spin and Butterfly Spins to offer comforting relaxation.

Low volatile slots feature higher frequency of payouts but cannot offer the massive wins associated with high volatility games. As such, they're best suited for calculated risk-takers but still provide generous long term return values - some good examples being Halloween Fortune and Soldier of Rome which both boast medium RTP rates.