Moon Princess slot review

What kind of game the Moon Princess slot is

Moon Princess is a grid slot from Play’n GO, the Swedish studio best known for Book of Dead and Reactoonz. Instead of reels spinning across paylines, symbols fill a five-by-five grid, wins are removed, and new symbols drop in from above. That chain of cascading reels is the engine of the game, and three princess characters add powers that step in when a spin would otherwise lose.

The game is rated high volatility with a 96.50% RTP and a 5,000x ceiling. That ceiling is lower than many recent high-volatility slots, which is a useful reminder that volatility describes how unevenly a game pays, not only how high its top prize goes.

One spin of Moon Princess, step by step

Because so much happens inside a single paid spin, it helps to follow one from start to finish.

1. You place your stake and the grid fills with 25 symbols.
2. If there is a win, the winning symbols are paid and removed, and the symbols above fall to fill the gaps, with new ones dropping in from the top.
3. Each consecutive win in the chain raises the multiplier, so later cascades in the same spin pay more.
4. The chain continues until no new win forms.
5. If the spin produced no win at all, the active princess may use her power to try to create one.
6. Princess wins add to a meter; when it fills, the next bonus spin uses all three princess powers together.
7. If every symbol has been cleared from the grid, free spins begin.

All of this counts as one game cycle for your stake. UK design rules require at least 2.5 seconds per paid spin, and cascades simply play out within that cycle.

How the features work in Moon Princess

Cascades and the growing multiplier

Every win is cleared from the grid and replaced from above, which gives a single spin the chance to produce a run of wins. A multiplier climbs with each consecutive win in that run, so the third or fourth cascade pays more than the first. Our checked data does not give the multiplier’s steps or how it resets in the base game, so check the paytable for those numbers.

Princess powers on losing spins

On a spin that would otherwise lose, the active princess can use her power. Between them the three princesses can:

• Transform symbols, turning some symbols into others to create a match.
• Add wilds to the grid, which substitute to complete wins.
• Remove symbols, clearing some away so that those above fall and may form a win.

Princess wins feed a meter. When it fills, you get a bonus spin in which all three powers are used, which is the base game’s strongest moment. The Slotcatalog Moon Princess page (opens in a new tab) describes the same structure.

Clearing the grid for free spins

Clearing every one of the 25 symbols from the grid triggers free spins. Before they start you choose a princess, and her power is used on every losing spin during the round. The most important difference from the base game is that the multiplier does not reset between free spins, so it can keep growing across the whole round. That carry-over is where the 5,000x ceiling becomes reachable, in rare cases.

Our checked data does not confirm how many free spins are awarded or which princess holds which power, so read the game’s rules before you choose. The choice changes how the round plays, not its long-run value, which is already part of the 96.50% RTP.

Moon Princess RTP and volatility in pounds

A 96.50% RTP means the game keeps 3.5% of all stakes on average over the long run. High volatility means the return comes in bursts: many spins cost the full stake, and a minority of spins, mostly those that clear the grid or chain several cascades, make up for them.

The 300-spin column assumes wins are recycled into more spins, which is how most sessions run. At 10p, £20 could carry a 300-spin session with a modest expected loss; at £1, the same session puts £300 through the game and the average loss is more than half the original budget. In a high-volatility game, actual results scatter widely around those figures, so a session can easily end early. Our guide to slot volatility explains the spread.

The Moon Princess max win in context

Moon Princess caps wins at 5,000x the stake. It is a ceiling written into the rules, not an expected outcome, and only an exceptional free spins round with a long-running multiplier gets close.

If the cap matters to you, the newer Moon Princess 100 states 15,000x with a top RTP of 96.2%. See what a slot’s max win means for how caps are applied.

How to play Moon Princess online

1. Register with a UKGC-licensed casino and complete age and identity checks; these are also required for demo play.
2. Set a deposit limit at the prompt before your first deposit.
3. Find Moon Princess in the lobby and check the RTP shown in its help screen.
4. Choose your stake: £5 a spin is the legal maximum at 25 and over, £2 at 18 to 24.
5. Spin manually, then watch cascades, princess powers and the meter play out.
6. If you clear the grid, pick a princess for the free spins round.
7. Keep an eye on the net spend and time display, and stop when your limit is reached.

Moon Princess UK rules: stakes, speed and RTP display

The Commission’s RTS 14 responsible product design standard (opens in a new tab) is why UK slots spin no faster than once every 2.5 seconds and have no turbo, slam-stop or autoplay. Our game speed rules page covers the detail, and the slot stake limits explain the £5 and £2 caps.

Casinos must also make the game’s return information available. Some games come in several RTP versions, so the help screen at your casino is the place to check, and our RTP information rules page explains what you are entitled to see.

Slots like Moon Princess

Reactoonz and Gemix use cluster pays on 7 × 7 grids with cascades, while Starlight Princess pairs a princess theme with scatter pays on a 6 × 5 grid. For a gentler game, Gemix is rated medium volatility. Browse every review on our slots hub, or filter by high volatility slots.

Moon Princess myths and facts

• Myth: picking a certain princess raises the RTP. The choice changes how free spins play, but the long-run return is fixed by the game version.
• Myth: a filled meter means a big win is coming. A full meter gives a bonus spin with all three powers, not a large payout.
• Myth: the grid is close to clearing, so keep going. Each spin is independent; see the gambler’s fallacy.

Results come from a certified random number generator, as explained in our guide to how slots work, and the Wizard of Odds slots page (opens in a new tab) sets out why no timing or pattern changes a slot’s expected return.

Where to play Moon Princess in the UK

Our partner offers are tied to particular slots or selected games rather than to Moon Princess, so treat them as a separate thing and check each casino’s game lobby for the game itself. 18+ only; terms apply.

• PlayOJO: with a first deposit of at least £10, new UK customers outside Northern Ireland get 80 free spins on Big Bass Bonanza at 10p a spin. Winnings come as cash with no wagering, and the offer works only through the designated link and can’t be combined.
• Coral: between 1 October 2026 and 1 February 2027, deposit and bet £10 or more on slots for 100 free spins at 10p on selected games. Accept within 48 hours, use within 7 days; no wagering on winnings. Deposits by Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards are excluded.
• Ladbrokes: deposit and spend £10 or more on slots and receive 50 free spins daily for 10 days, a maximum of 500, at 10p on selected games. Claim before 23:59 each day and use within 7 days; no wagering. Prepaid card, PayPal, Paysafe, Neteller, Skrill and Moneybookers deposits don’t count.

Coral and Ladbrokes belong to the same operator, LC International Limited, so you may not be able to take both new-customer offers. Spins let you try games at the casino’s expense; they are not a way to earn money.

18+. Every casino game has a built-in house edge, so over time you should expect to lose what you stake. Set a budget before you play and stop when it’s gone: safer gambling tools and support. Free, confidential help: National Gambling Helpline 0808 8020 133.