Best Massive Studios Slots in UK 2025

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18+| Welcome bonus for new players only. Maximum bonus is 290% up to £ 3000. Min deposit is £ 10. Max cashout is х5 the bonus amount for cash bonus and free spins. The cash bonus (for each step) has a wagering requirement of х40. Free spins (for each step) have a wagering requirement of х30. Bets placed with free spins are equal to €0.2. Gambling can be addictive. Play responsibly.

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What is RTP?

RTP, or Return to Player, is a percentage that shows how much a slot is expected to pay back to players over a long period. It’s calculated based on millions or even billions of spins, so the percent is accurate in the long run, not in a single session.

In casino games, the ‘house edge’ is the common term representing the platform’s built-in advantage. For example, it is about 0.5% in blackjack, meaning the casino holds 0.5% of all bets over time.
RTP is the key figure for slots, working opposite the house edge and showing the potential payoff to players.

Let’s consider the example:
The Book of Dead has an RTP of 94.25%. It means that for every $100 bet, you can expect to receive $94.25 back in the long run. The remaining $5.75 is what the casino keeps.