Planet Moolah slot review

Planet Moolah slot: Invaders from the Planet Moolah

Most players simply call it Planet Moolah, but the game’s full title is Invaders from the Planet Moolah. It was made by WMS, a long-established American slot maker that is now one of the brands of Light & Wonder. As the name suggests, the theme is a space invasion, and the mechanic that defines the game is cascading reels.

Search for both names when you look for it in an app, because lobbies don’t always use the full title. The specifications below are the ones we could verify; there’s no confirmed release date or maximum win in them, so we don’t quote either.

How the features work in Planet Moolah

Cascading reels

After every win, the symbols that formed it are blasted off the grid. The symbols above drop down and new ones fall in from the top to fill the space. If the new arrangement creates another win on any of the 25 lines, the process repeats, and it keeps going until a cascade produces no win.

Wins in sequence and the bonus features

Planet Moolah doesn’t treat each cascade as an isolated event. Wins that follow one another in an unbroken sequence count towards the game’s bonus features, and free spins are among them. The longer a chain runs on a single spin, the more it contributes.

The exact thresholds, and what each feature awards, are set out in the paytable. Because those details aren’t in the specifications we verified, open the game’s help screen for them rather than relying on summaries elsewhere.

Fixed paylines

All 25 lines are always active. You choose the total stake, and it covers every line on every spin, so there’s no setting to adjust and no risk of playing with lines switched off by mistake.

One stake, several wins: what cascades mean for your money

Cascades are easy to misread. A chain of five wins feels generous, but it’s all part of a single paid spin, and the game’s RTP already includes every cascade it will ever produce. They change the rhythm of play, not the long-run price.

What cascades do change is how a spin looks. Several small wins on one spin can still add up to less than you staked, and UK rules stop games from celebrating any return that is equal to or less than the stake. If the game stays quiet after a cascade, that is often the reason.

Our explainer on slots on mobile compares cascades with other ways games pay out, and the paytable glossary entry explains how to read the payout screen.

Planet Moolah RTP: 96% or 95%?

Sources disagree slightly on this game: 96% is the commonly listed figure, while some list 95%. That may reflect different versions supplied to different markets or casinos. Either way, a single percentage point changes the cost noticeably over many spins.

UK-licensed casinos must make game rules and return information available to players, as the Gambling Commission’s remote technical standards (opens in a new tab) require. Look in the game’s menu for the figure, and use our guide to finding a game’s RTP in an app if it isn’t obvious.

Playing Planet Moolah on a £20 budget

Medium volatility suggests results that are less extreme than in high-volatility games: fewer long droughts, and fewer very large payouts. The average cost is still fixed by the house edge, and losing is the likely result over time.

The hourly column uses the fastest pace UK rules allow (one spin every 2.5 seconds, or 1,440 an hour) multiplied by the 4% edge. On the 95% version, each figure is a quarter higher: £7.20, £36 and £72 an hour.

Planet Moolah is not Mega Moolah

The names are close, and both turn up in searches together, but they are unrelated games from different studios. Mega Moolah is a progressive jackpot slot; Planet Moolah is a cascading-reels game with no progressive jackpot in its verified specifications.

If you were looking for the jackpot game, our Mega Moolah review covers it, and our guide to jackpot slots on mobile explains how progressive prizes are funded.

WMS and Light & Wonder, the makers of Planet Moolah

WMS started life as the American arcade and pinball maker Williams before turning to slot machines; Wikipedia’s WMS Industries article (opens in a new tab) covers that history. It is now one of the brands of Light & Wonder, the company known as Scientific Games until it was renamed in 2022.

Light & Wonder is based in Las Vegas and is listed on the Australian Securities Exchange as LNW. Its other brands include Barcrest, Bally and Shuffle Master, and its best-known slot in the UK is Barcrest’s Rainbow Riches. Our Light & Wonder studio page lists more of its games.

Planet Moolah on iPhone, Android and tablet

Current versions of WMS slots for online casinos are HTML5 games, so Planet Moolah opens inside a casino app or a mobile browser with no separate download. A 5×3 grid is one of the easiest layouts to read on a phone, and cascades are clear to follow even on a small screen.

1. Pick a UK-licensed casino app and install it from the App Store or Google Play; avoid unofficial download links. Our guide to spotting fake casino apps shows the warning signs.
2. Register, then complete the age and identity checks that come before any deposit.
3. Set a deposit limit when the app asks, or later in your account’s safer gambling settings.
4. Search the lobby for “Planet Moolah” and, if nothing appears, for “Invaders”.
5. Open the game’s help screen and note the RTP shown there.
6. Choose a low stake and start each spin yourself; there’s no autoplay in UK slots.

If the game is slow to load on an older handset, our page on casino apps on older phones explains common fixes.

UK rules that shape Planet Moolah

Slot rules in Great Britain apply to every game, including older titles like this one. The Gambling Commission brought in the main design changes in October 2021, as its announcement of the online games package (opens in a new tab) set out.

Since a Gambling Commission warning in January 2020, feature buy-ins are not offered to British players. Our page on UK slot stake limits explains how operators apply the age-based caps.

Games similar to Planet Moolah

• Raging Rhino: another WMS game, on six reels and four rows with 4,096 ways, a 95.91% RTP and high volatility.
• Dancing Drums: a Light & Wonder slot with 243 ways and a 96.09% RTP.
• Rainbow Riches: Barcrest’s 20-payline UK favourite, also within the Light & Wonder group.
• Gonzo’s Quest: NetEnt’s 20-payline game with a 95.97% RTP and medium volatility.

Browse the full list on our slots hub, or compare apps on our best slot apps page.

Where to play Planet Moolah in the UK

We can’t confirm which partner apps carry Planet Moolah, so check each lobby before you join. The welcome offers below are for new customers aged 18+, terms apply, and the spins are on games each casino selects.

• PlayOJO: first deposit £10 or more and you get 80 free spins, each worth 10p, on Big Bass Bonanza. Winnings are paid as cash because there’s no wagering. For new UK customers outside Northern Ireland, via the designated link only, and not combinable with other offers.
• Coral: after a qualifying deposit (some methods don’t count), bet £10 or more on slots to receive 100 free spins at 10p on selected games. Accept within 48 hours, use within 7 days; winnings are wager-free. The offer runs 1 October 2026 to 1 February 2027.
• Ladbrokes: deposit and spend at least £10 on slots for 50 free spins a day across your first 10 days, up to 500 in total, at 10p on selected games. Claim each set by 23:59; they last 7 days, with no wagering.

Coral and Ladbrokes are both operated by LC International Limited, so holding new accounts at both may not be possible. Deposits by PayPal, Skrill, Neteller, Paysafe or prepaid card don’t qualify for either.

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.