Moon Princess slot review

Moon Princess slot at a glance

Moon Princess drops the usual reels and paylines for a 5 × 5 grid of symbols that cascade after every win. The theme centres on three princesses, each with a different power that can rescue a spin that would otherwise lose.

It comes from Play'n GO, a privately held studio in Växjö, Sweden, whose first gaming product dates from 1997. The same studio makes Book of Dead and Reactoonz, both in our mobile slot reviews.

How the features work in Moon Princess

The easiest way to understand Moon Princess is to follow one spin from start to finish.

1. The grid fills with 25 symbols.
2. Any winning symbols are removed, and new symbols fall from above to fill the gaps.
3. Each consecutive win in the same spin increases a multiplier, so a long chain of cascades is worth more.
4. If a spin ends without a win, the active princess can use her power: transforming symbols, adding wilds or removing symbols.
5. Wins made with a princess's help fill a meter. When it is full, a bonus spin follows in which all three powers are used.
6. If the cascades clear every symbol from the grid, free spins begin.

Free spins

At the start of the free spins you choose one princess. Her power is used on every losing spin in the round, and the multiplier does not reset between spins, so it can keep building.

Princess powers are part of the game's design and its 96.50% RTP. Choosing one princess over another is a matter of taste; the game's rules describe what each power does.

Moon Princess RTP and volatility explained

An RTP of 96.50% means a 3.50% house edge: across a very long run, every £100 staked returns £96.50 on average. That's roughly in line with Play'n GO's other grid games, such as Rise of Olympus at 96.50%.

High volatility means the princess powers and cascades produce plenty of small results, but the large outcomes depend on a growing multiplier or the free spins. Long, unrewarding runs are normal.

Play'n GO games can be offered at more than one RTP setting; its Moon Princess 100 sequel, for example, lists 96.2% as its top version. Always check the figure on the game's help screen. Our guide to how to find a game's RTP in an app explains where.

What Moon Princess costs per 100 spins

A per-100-spins view makes the 3.50% edge easy to picture. Expected loss = total staked × 3.50%.

So 100 spins at 10p cost 35p on average, and 100 spins at £1 cost £3.50. Because the game is high volatility, real sessions swing well away from these averages. A £20 budget at £1 a spin can end after 20 spins without a grid clear.

Moon Princess vs Moon Princess 100

Play'n GO released a follow-up, Moon Princess 100. On paper it's a more extreme game: a lower top RTP and a much higher ceiling.

If you prefer the original's balance, stick with it. If the larger ceiling appeals, read our Moon Princess 100 review first, since a 15,000x maximum usually means more of the return sits in rare outcomes.

Playing the Moon Princess slot on iPhone and Android

Moon Princess runs in HTML5, so you open it inside a casino app or mobile browser without a separate download. A square 5 × 5 grid suits a phone reasonably well, although symbols are smaller than on a 5 × 3 game.

Which orientation it uses depends on the version and the app, so rotate your phone to see what works. Our portrait vs landscape guide and casino apps and battery life guide cover practical comfort points.

• iPhone users: see casino apps on iPhone for App Store requirements.
• Android users: see casino apps on Android phones for Google Play and installation.
• Cascade animations are frequent, so Wi-Fi is steadier than a weak mobile signal.

UK rules that affect Moon Princess in apps

Cascading games produce a lot of small wins, which is why one UK rule matters here more than usual. Under RTS 14 on responsible product design (opens in a new tab), a game must not celebrate a return that is less than or equal to your stake. So a 20p cascade on a £1 spin shouldn't get lights and music.

The stake caps are explained in the Commission's online slots stake limit guidance (opens in a new tab). Feature buy-ins are not offered to British players since a Gambling Commission warning in January 2020. More on our game design rules page and why slots spin slower on UK apps.

Slots like Moon Princess

• Reactoonz: Play'n GO's 7 × 7 cluster-pays grid, 96.51%, high volatility, 4,570x.
• Rise of Olympus: Play'n GO's 5 × 5 grid with three gods instead of three princesses, 96.50%, 5,000x.
• Starlight Princess: Pragmatic Play's princess-themed 6 × 5 scatter-pays game, 96.50%, 5,000x.
• Moon Princess 100: the sequel, with a 15,000x ceiling.

Our best slot apps list ranks partner apps by the breadth of their slot lobbies.

Moon Princess review: our verdict

Moon Princess suits players who enjoy watching a grid react and like a bonus with a choice. It's less suited to anyone wanting slow, steady sessions on a small budget.

Where to play Moon Princess with a welcome offer

We can't promise any partner app lists Moon Princess, so search the lobby first. The offers below are all 18+, terms apply, and the free spins are on named or selected slots.

• PlayOJO: 80 free spins on Big Bass Bonanza at 10p for new UK customers (Northern Ireland excluded) on a first deposit of £10 or more. No wagering; winnings are cash. Designated offer link only; can't be combined with other offers.
• Coral: 100 free spins at 10p on selected games when new players deposit and bet £10 or more on slots, between 1 October 2026 and 1 February 2027. Accept within 48 hours; 7 days to use; no wagering on winnings. Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards don't qualify.
• Ladbrokes: up to 500 free spins, 50 a day for 10 days at 10p each on selected games, for new customers who deposit and spend £10 or more on slots. Claim before 23:59 daily; 7-day validity; no wagering. Prepaid cards, PayPal, Paysafe, Neteller, Skrill and Moneybookers deposits excluded.

Their face values are £8, £10 and up to £50. Coral and Ladbrokes are run by the same company, LC International Limited (Entain), so you might not be able to open both. Compare PlayOJO and Ladbrokes in Ladbrokes vs PlayOJO.

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.