Moon Princess

Provider

Play'n GO

Default RTP

96.5%

Volatility

High

Maximum win

5,000x

Core mechanic

Cascading grid

What Moon Princess is

Moon Princess is a 2017 Play'n GO slot built on a 5x5 grid with three anime-styled protagonists — Love, Star and Storm — each providing a different feature. Default return is 96.50%, volatility is high, and the maximum win is 5,000x your stake, though some sources publish 4,200x for certain builds.

It is the original of the pair that includes Rise of Olympus, and the older sibling is the slightly gentler of the two. It is also one of the more commonly offered games in casino free-spins promotions, which makes the RTP configuration question below particularly relevant.

The 5x5 grid and how wins form

Twenty-five positions, no paylines. Wins form when three or more matching symbols connect horizontally or vertically. Diagonals do not count.

Winning symbols are removed and everything above cascades down to fill the gaps. If the new arrangement forms another connected group of three or more, it pays and the cascade continues until nothing new forms.

A three-symbol minimum means wins land often. It also means minimum clusters pay very little, so a large share of registered wins return less than the stake.

The three princess powers

When a cascade sequence ends without producing a new win, one of the three princesses activates and applies a feature. They rotate rather than firing randomly, so you can see which is coming.

• Love — turns one symbol wild.
• Star — changes one symbol type into another to force clusters.
• Storm — destroys two symbol types from the grid.

Each power fires once per sequence, and the rotation resets between spins. Their job is to keep a stalled sequence going, and they are the reason the base game rarely feels completely dead.

Girl Power and the multiplier

Beyond the individual powers, the game tracks a Girl Power meter. Filling it triggers all three princesses in sequence on the same grid, which is considerably more powerful than any single power and frequently produces the game's better base-game results.

The game also applies a win multiplier that climbs through consecutive cascades within a sequence, and the multiplier behaviour is enhanced during free spins. Long chains are therefore worth disproportionately more than the individual cluster payouts suggest.

The free spins round

Clearing the entire grid triggers the free spins round. You are then offered a choice of princess: taking one of the three means only that princess's power is active during the round, but at an enhanced strength.

The options are broadly balanced in return terms — the studio does not hand out expected value for choosing correctly. What differs is the shape. Storm's destruction produces bigger swings, Love's wilds produce steadier chains, and Star sits between them. If you want the round to run long, the steadier option serves better; if you want the ceiling, the aggressive one does.

The win multiplier climbs through the round, and further grid clears extend it.

Clearing the grid

To reach the free spins, you must remove all twenty-five symbols in one continuous sequence of cascades and princess powers. That is the hardest thing in the game.

Most sequences stall with several symbols left, and the three powers — one use each per sequence — are often not enough to finish. This is why a game with a three-symbol cluster minimum and constant small wins is nonetheless rated high volatility: the payoff is gated behind an event that is genuinely rare.

Treat a grid clear as the prize rather than the gateway. On a typical session you will see very few.

Symbols and paytable

Symbol	Role	Notes
Love, Star, Storm portraits	Premium symbols	Highest cluster payouts
Hearts, stars, moons, lightning	Mid and low pays	Frequent; minimum clusters pay little
Wild	Substitutes in clusters	Created by Love's power rather than landing freely

All payouts are quoted against total bet. There is no scatter symbol — the grid clear is the trigger.

RTP configurations — the documented tiers

Moon Princess is one of the titles where the configuration spread is documented explicitly. Reported tiers are approximately:

Version	Return	House edge	Cost per $1,000 staked
Default	96.50%	3.50%	~$35
Reduced	~94.51%	5.49%	~$55
Reduced	~91.49%	8.51%	~$85
Reduced	~87.50%	12.50%	~$125
Lowest	~84.50%	15.50%	~$155

Same artwork, same princesses, same features, same ceiling across all five. Only the number in the information screen changes, and it changes the cost of playing by a factor of four at the extremes.

Because this title appears frequently in free-spins offers, it is worth checking the version once your spins are credited — the offer terms will not tell you which build the casino runs.

Volatility and the ceiling

High volatility with a busy surface. Small clusters land constantly, princess powers fire on most stalled sequences, and the Girl Power meter gives you something to watch. Underneath, the free spins round requires a full grid clear and most sessions produce few or none.

Published ceilings vary between 4,200x and 5,000x depending on the source and build, and either way it is reached through an extended free spins round with a high accumulated multiplier. Wins above 200x are notable here.

The pattern worth naming: constant activity with a rare payoff is the profile most likely to extend a session past its intended length. There is never a natural moment where the game goes quiet and prompts you to stop.

Stake sizing in practice

• Stakes run from around $0.20 to $100 per spin. Read the total bet field rather than the coin value.
• Budget for at least 200 spins, since grid clears are rare and the round is where the return concentrates.
• When offered the princess choice, decide in advance which shape you want rather than picking in the moment.
• Do not raise stakes after near-clears. Nothing carries between sequences.
• Set a time limit as well as a loss limit.

The Moon Princess family

• Moon Princess 100 and Moon Princess Trinity are the higher-variance later entries with larger ceilings.
• Rise of Olympus is the Greek-themed reworking of this exact structure, tuned more aggressively.
• Rise of Olympus Origins is the gentler cousin, commonly quoted around 96.25% with medium volatility.
• Reactoonz is the Play'n GO cluster game where features fire constantly and nothing is gated behind a rare trigger — a better fit for a small bankroll.

Who this suits

This suits a player who enjoys grid-clearing games, likes the readable rotation of the three powers, and has the bankroll and patience for a bonus that is hard to reach. It is slightly more forgiving than Rise of Olympus, so it is the better of the pair to start with.

It suits less well anyone on a small budget, and it needs the RTP check more than most because of how often it appears in promotional offers. On the 96.50% build it is a solid high-variance game; on an 84.50% build it is one of the worse bets in a licensed casino, with nothing on screen to tell you which you have.

FAQ

Common misconceptions

The first is that the Girl Power meter carries over between spins. It does not — everything resets when a spin ends, so a nearly-full meter is worth nothing on the next spin.

The second is that one princess pays better than the others in free spins. The options are balanced in return terms; they differ in the shape of the outcome, not its expected value.

The third is that free spins offers on this game are equivalent regardless of casino. They are not, because the underlying build may be running anywhere from 96.50% down to about 84.50%. Two identical-looking offers can differ enormously in what they are actually worth.

Where this fits in a session

Moon Princess is the gentler of the two grid-clear games and the better one to start with if the format appeals. It still needs a budget sized for a few hundred spins, because the free spins round is the payoff and grid clears are rare.

The specific thing to watch here is the combination of constant small wins and a rare bonus. That profile keeps a session going without ever prompting you to stop, so decide your spin count and your walk-away number before the first spin rather than during the session.

Reading the info screen

• The return figure. Documented tiers run 96.50%, 94.51%, 91.49%, 87.50% and 84.50%. This is the check that matters most on this title.
• The cluster minimum and the no-diagonals rule.
• The princess power descriptions, including the enhanced free spins versions, so the choice screen is not a guess.
• The multiplier rules — how it climbs through cascades and whether it persists across the free spins round.
• The Girl Power meter conditions for filling it.
• The total bet field before spinning.

If you are playing this game on free spins from an offer, check the return figure once the spins are credited. Promotions almost never disclose which build a casino runs, and on this title the spread between the best and worst configuration is a factor of four in house edge.