Invaders Megaways™

Invaders Megaways™ Slot Review

Slot Provider: SG Digital

RTP: 96.3% | Variance: High | Maximum Win: 25,000x

Our Score: 8.8

Play at Casumo Casino

WHY YOU CAN TRUST THIS REVIEW: The information and opinions on this page are the result of an comprehensive process of information gathering and live game testing by the gambling experts who work at Find out more here.

About Invaders Megaways™

Reviewed by:

Published Date: 22nd July 2021

How We Review Slot Games

We test and rate all slot games across 5 criteria, assigning a score out of 10 for each and an overall score that is an average of the 5. To build an accurate assessment of each game we gather information from the supplier and play in real play or demo mode. Find out more.

Invaders Megaways is a superb 6-reel slot from SG Digital with high variance and a top win of 25,000x. It has a light-hearted cartoon atmosphere. As well as cascading wins, on every spin an alien space ship picks out one symbol to convert to wilds on the reels. The highlight is the free spins round in which up to 15 free plays are awarded. Each free spins comes with a modifier including expanding symbols, progressive multipliers or even reels expanding to 10 rows high. The maximum paylines in play during free spins is 1,000,000! Play from 25p per spin.

Invaders Megaways™ Game Information

  • RTP: 96.3%
  • Variance: High
  • Maximum Win: 25,000x
  • Progressive Jackpot: No
  • Reels: 6
  • Rows: Up To 7
  • Paylines: 117,649
  • Minimum Stake: £0.25
  • Theme: Aliens, Space
  • Features: Cascading Wins, Wild Transformations, Expanding Reels, Free Spins, Wilds, Wild Multipliers

Testing Notes: Here’s What Happened When We Played Invaders Megaways™

IMPORTANT: To give you an accurate assessment of the games we review our writers play 200 spins. Whilst this is a useful tool to help us review games and to give an example of what might happen when you play, keep in mind that 200 spins is only a very small sample and cannot be used to accurately predict what might happen over another 200 spins. The outcome of all slots play is always random.

Boom Or Bust? Our Session By The Numbers

I played 200 spins on Invaders Megaways for free at Casumo Casino to test the game and this is what happened.

  • Stake Size: £1
  • Start balance: £1,000
  • End balance: £1,065.16
  • Biggest Win: 126.92x
  • Free Spins Feature: 1
  • Session Time: 30 minutes 37 seconds

For 128 spins Invaders Megaways was a very frustrating game. Once the novelty of the UFO Wild Selector wore off, it was a tough play as not a lot happens. I didn’t see the Unicow appear to expand the reels to 10 high at any point in 200 spins, and most wins were small in size due to the low paytable values.

A big win in testing in free spins
A 126.92x win from free spins in testing

However, things got interesting when the free spins round triggered on the 129th spin. I started with 7 spins but thanks to re-triggers played 21 in total. The overall win was 126.92x, which is not huge, but still came from a showcase of all the modifiers. The best was the Alien which triggered several times to increase reel rows, add more win ways, and also led to more bonus symbols dropping for the re-trigger. The other useful modifier was the Invaders logo which triggered some good wins when the Invaders logo expanded with a 4x multiplier.

In short, outside of the free spins feature the game was a tough play and typically tight for a high variance slot. However, the free spins round did give a glimpse of what can happen when it’s in the mood to pay out.

What We Liked

  • Fun and entertaining theme
  • Unicows with 1,000,000 paylines!
  • Random transforming wilds
  • Up to 15 free spins with re-triggers
  • Top win of £250,000

What We Didn't like

  • Variance a bit high for some
  • Symbols have low values

Invaders Megaways™ Review Scores

  • Theme and Design 9
  • RTP and Variance 9
  • Maximum Win 9
  • Symbols and Paytable 8
  • Features and Gameplay 9

What Our Reviewer Says ...

"A superbly original Megaways adventure with a light-hearted and fun theme. Just beware of a super-high variance that makes it a tough one to crack!"

Overall Score: 8.8

Theme & Design

Our Score 9

Invaders Megaways showcases SG Digital’s creative talents throughout, invoking the spirit of 80s Space Invaders games, as well as tales of abductions in mid-west America, and all with a Men In Black style humour. The game is set in a rolling landscape of corn fields and remote houses, with crop circles visible under a starry sky. The cartoon style is fun and the paytable is stacked with cosmic ray guns, mad scientists, cows ripe for abduction and aliens giving the peace sign.  And it’s all capped off with a bleepy, techno soundtrack that drives the action along relentlessly. Top stuff!

Invaders Megaways by Light and Wonder
Invaders Megaways – fun, comic book Space Invaders style production

RTP and Variance

Our Score 9

What is RTP?

RTP (Return to Player) refers to the amount a game will pay out in cash prizes expressed as a percentage of all the money wagered on that game. For example, a 96% RTP means a game will pay out £96 for every £100 wagered. This is an average number and will vary from one session to the next.  Read more here.

What is Variance?

Variance refers to how far a game will deviate from its RTP over time. High variance games deviate a lot and produce uneven win distributions and unexpected windfalls. Low variance games provide a more stable and even distribution of wins. Read more here.

Invaders Megaways has a very respectable 96.3% RTP which is about average for online slot games. This is also, as you would expect from a Megaways title, a high variance game with a volatile payout distribution. However, it’s fair to say from our testing that Invaders does kick out regular wins, if at the cost of having very low symbol values and therefore very small payouts until you hit the free spins bonus round where things can get much more epic. 


Maximum Win

Our Score 9

What Is Maximum Win?

Maximum win refers to the maximum amount a player can win from one spin. It is expressed as a multiple of the stake. For example, where the maximum win is 100,000x, from a £1 stake, the maximum win would be £100,000.  

The maximum payout in Invaders Megaways is 25,000x. By any standards, that isn’t bad. If you like high paying slots, check out our list of the slots with the highest maximum wins.

Symbols and Paytable

Our Score 8

Invaders Megaways has a standard 6 reel set up with between 2 and 7 rows on each reel, randomly decided on each spin. It is a win ways game which means it pays for identical symbols on adjacent reels from left to right, starting on reel 1, regardless of their row position.

Invaders Megaways paytable
The paytable with 4x for 6 Invaders logos

That is how you get up to 117,649 win ways per spin when all 6 reels show 7 rows (7x7x7x7x7x7).

The paytable doesn’t show huge value, but remember, you have so many win ways and features to enhance those values. At the low end are the cards, 9 through to Ace. These are valued at from 0.04x for 3 9s up to 0.28x for 6 Aces. Premiums are the ray guns, a nervous looking cow, a mad scientist, a little green alien, and the Invaders logo. These are valued at from 0.08x for 3 ray guns up to 4x for 6 Invaders logos.

Features and Gameplay

Our Score 9

There is certainly no shortage of features in Invaders Megaways, from the traditional Cascading Wins through to some very fun and compelling modifiers that come into play in the free spins round, mixing wilds, multipliers, expanding symbols and stacks, and an Alien that triggers an instant increase in paylines up to 1,000,000.

Cascading Wins 

SG haven’t forgotten the bread and butter feature that the best Megaways™ games have – look out for this every time you score a win. The winning symbols are removed from the reels and new ones drop in to replace them. If this creates more wins, so the process repeats. Until no more wins occur.

UFO Wild Selector

SG get creative here – above the reels is a 5×1 row containing each of the symbols in the paytable. When a spin is activated, a small UFO hovers over these symbols before choosing one to land on. When this happens, instances of the selected symbol on reels 2 to 5 are zapped and transformed into wilds to increase the chances of scoring a win.

UFO Wild Selector
The Wild Selector chooses the 9 to convert to Wilds

Unicow Feature

One of the highlights of Invaders is the Unicow feature which triggers on base game spins only. When the Unicow lands, EVERY reel will then expand to between 7 and 10 rows high, creating up to 1,000,000 winlines.

Free Spins Feature With Modifiers on EVERY Spin

Finally, we get onto the main event – the free spins round.

You’ll need to land FOUR or more scatter symbols to trigger the spins. Four scatters gets you 7 free spins, five gets you 10 free spins, and six or more gets you 15 free spins. It is also possible to increase the free spins total further during the round by landing between 3 and 6 scatters to get you between 4 and 15 free spins.

Invaders Megaways free spins round
Free Spins round launches in testing

Then, once the round begins, the UFO will do its thing above the reels, turning every instance of one symbol into a wild. Additionally, there is a different modifier associated with each symbol, and they work as follows:

Invaders Logo: All highest paying logo symbols will expand to cover the entire reel, creating potential for a big payout.

Mad Scientist: A win multiplier with x2 value is applied to any win. Then, each successive win in a cascade sequence doubles the win multiplier up to a max multiplier of 256x.

Alien: if the alien is the selected symbol, each time it lands on the reels, it will enhance the height of the reels as well as each adjacent reel. This can create up to 1,000,000 winning ways.

Expanding reels modifier in free spins round
Alien modifier expands the reels up to 10 rows high

Cow: If the cow symbol appears, it becomes a wild with a value of x2.

Ray Gun: 1 Wild will be delivered to the reels for every ray gun symbol that lands. This doesn’t apply to cascading ray gun symbols.

The Final Verdict

SG Digital have once again shown themselves to be ahead of the pack when it comes to delivering top fun Megaways™ slots. There is a lot to love here and we can be pretty sure that when the dust settles on this release, Invaders will show itself to have longevity and retain popularity for a long time into the future. Not least because of the creative efforts that have gone into weaving the theme and inherent humour throughout both the artwork and gameplay. Indeed, the fun factor goes way beyond the aesthetics as for a high variance game this slot triggers features at a higher frequency than most others. Whilst the wins may be small in the base game, at least you are getting some action and engagement for your money, rather than those long draining runs where nothing gives and your balance runs dry. And with 256x multipliers and a max win of 25,000x available in the free spins round, I suspect there will be some epic wins delivered in time here too.

Useful Tips When Playing Invaders Megaways™

Remember, online slots are games of chance, there is NO strategy that can improve your odds of winning. However, reading our review and following these tips will help you get the most out of your time playing this slot game.

1. Choose A Low Stake

During testing this felt like a very volatile game with lots of dead spins or spins with very small wins. To make your balance last as you try to unlock the bonus round I recommend starting at a low stake.

2. Look For The Alien Modifier In Free Spins

The best modifier for me during the free spins round was the Alien one. This expanded his own reel and adjacent ones up to 10 high, bringing in many more win ways AND the chance to see more bonus symbols to re-trigger the round.

3. The Unicow Can Bring Big Wins In The Base Game

The elusive Unicow could also be very powerful in the base game. This expands reels to up to 10 rows high for the chance to hit that magical 1,000,000 max win ways. I didn’t see this once in 200 spins … but it’s there!

4. Play Only At Recommended UK Slot Sites

We recommend the sites on this page because they are licensed by the UK Gambling Commission which means they must adhere to strict regulation that makes them fair, safe and secure.

Who Made Invaders Megaways™?

  • Name: SG Digital
  • Established: 1940s
  • UK License: 41115
  • Total Games: Over 2,000
  • Known For: Huge aggregated catalogue of slots from many big names
  • Popular Slots: Rainbow Riches, Raging Rhino Megaways, Battleship Direct Hit
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