Thunder Shields Slot Review

The Thunder Shields slot is an epic Viking-themed game from iSoftBet with 5 reels and 40 paylines. Boasting superb 3D-style design and a sweeping orchestral score, it comes with a trio of potentially exciting features.  Each time a wild lands it triggers a Colossal Respin where the wild can expand to cover up to 4 reels as well as bring a multiplier into play. On any spin you could see up to 3 Mystery Stacks that all morph into the same matching symbol. Finally, there’s the Hold and Win, streak respin bonus where landing special shields can activate 5 potential modifiers. Find out more about this Norse saga in our in-depth Thunder Shields review.

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Thunder Shields Slot RTP, Details & Wager Limits

This Thunder Shields slot is played on a 5 reel, 4 row, 40 payline machine. Winners are formed by landing 3 or more of the same symbol or wild across a payline, starting from the leftmost reel (reel 1).

Stake sizes here start at 40p per spin, rising to a maximum of £40 per spin. Click on the coin below the spin button and adjust to suit. The autoplay button sits above the spin button. This allows you to run between 5 and 1,000 autospins, complete with adjustable win and loss limits.

The Thunder Shields RTP is 96% with the volatility in the medium to high range. The max win per spin is just 250 x stake. However, you can win up to 4,035 x your total stake from the Hold & Win Respins feature.

Theme - Audio and Design Features – go marauding for treasure with viking warriors  

Thunder Shields slot base game

There’s a very fresh, modern feel to the Thunder Shields slot. With a Viking theme, the setting is a Viking longship. This historical epic has a comic book quality and is superbly drawn.

Accompanying the graphics is a sweeping, orchestral backing track which is embellished with crackles of lightning and roars of thunder. It makes for quite the spectacle overall. I’d say this is the best designed slot we’ve seen so far from iSoftBet.

The reels are made up of A to 10 royals and 4 rather fearsome looking members of the crew. The best payer awards 6.25 x your total stake if you land 5 on a payline. Thor’s hammer is the wild symbol. Appearing on all 5 reels, it will replace any regular symbol mentioned. It also triggers a Colossal Respin (more info below).

Thunder Shields has been fully optimised for mobile play. The visuals are terrific, even on the small screen. You might want better speakers to get the full orchestral effect though. The gameplay is easy enough to follow on a mobile too. Overall, the Thunder Shields mobile slot is very well crafted.

Bonus Features in Thunder Shields

There’s an impressive variety of features on offer when you set sail with this band of Viking marauders. Highlights including Mystery Stacks, Colossal Respins and the Hold and Win bonus. You could also land 1 of 3 Thunderstorm Jackpot prizes.

Colossal Respins feature

Thunder Shields slot Colossal Respins feature

The Colossal Respins feature is triggered each time a wild hammer symbol lands. Reels 1 and 2 and filled with colossal 2x2 symbols during that respin.

If you land another wild on the respin, it expands the size of the colossal blocks as well as awarding another respin. The blocks here can cover all of reels 1 through 4. If you land a wild when you already have the 4-reel jumbo block active, it brings a multiplier into play which increases by 1 with each wild.

Mystery Spin feature

The shield is the Mystery Symbol. Randomly on any spin, you could see 3 fully Mystery Stacks appear. These all morph into the same matching symbol. A new payout calculation is then made with all the transformed symbols in position.

Hold & Win Respins feature

Thunder Shields slot Hold & Win Respins feature

The Hold & Win Respins feature is a variation on the classic streak respin feature. It is triggered by landing 6 or more Cash Shield symbols on the same spin. Those triggering Cash Shields each come with a cash value attached and are held. You’ll then receive 3 respins.

Joining the action here are 5 Special Shields which each award a modifier. If you land a Cash Shield or a Special Shield, the number of respins resets to 3. The round continues until when you’ve used up all your respins. The prize awarded is equal to the total amount on the Cash Shields. Here’s what the Special Shields award when they hit:

  • 2x Multiplier: this doubles the value of all the cash values currently on view
  • Collector: this collects all the cash values, opening up more positions which allows more Cash Shields to land
  • Reel Boost: this brings an extra reel into play
  • Cash Boost: this increases the value of all the cash values on the shields
  • Respins Boost: this adds 1 extra respin to your tally.

Thunderstorm Prizes feature

Land 3 Storm Shield symbols in the Hold & Win Respins feature and you’ll trigger the Thunderstorm Prizes feature. Randomly awarded, you’ll then win 1 of the following fixed jackpots:

  • Mini Jackpot = 10 x total stake
  • Minor Jackpot = 100 x total stake
  • Mega Jackpot = 1,000 x total stake

Thunder Shields Review Summary – superb design but nothing new

Viking epics have become more and more popular with slot players over the last couple of years. In the Thunder Shields slot, we have a prime example why.  For starters, it’s very easy on the senses. The sound and visuals are superbly done, creating a storming atmosphere.

The gameplay doesn’t offer anything new at all. The max win per spin is a mere 250 x your total stake. The biggest wins will come from the Hold & Win Respins feature. The fixed jackpots can also give you 1,000 x stake payouts. The game could have done with a free spins feature too.

If you like the Norse theme, there are better alternatives out there. Yggdrasil Gaming’s Vikings Go Berzerk and the Thunderstruck 2 slot by Microgaming and just 2 that are recommended.

Thunder Shields FAQs

What is the Thunder Shields RTP?

The Thunder Shields return to player rate is 96% which is about average. This is a medium to high variance slot with the bigger wins coming from the various bonus features.

What is the Thunder Shields max win?

The biggest win per spin is just 250 x stake. The fixed jackpots can give you 1,000 x stake wins but the Hold & Win Respins feature can deliver 4,035 x stake payouts.

What is the Hold & Win Respins feature?

The Hold & Win Respins feature is a variant of the streak respin. The triggering symbols are held and 3 respins are awarded. These reset if you land a new shield symbol. Look out for Special Shields that can award special multipliers here too.

Is Thunder Shield a jackpot slot?

No. There aren’t any progressive jackpots here but you could trigger the Thunderstorm Prizes feature and win 1 of 3 fixed jackpots of 10, 100 or 1,000 x stake during the Hold and Win Respins.

Thunder Shields Slot Information

  • Game:
    Thunder Shields
  • Provider:
    iSoftBet
  • Type:
    Video Slot
  • Reels:
    5
  • Paylines:
    40
  • Stakes Range:
    40p to £40
  • Bonus Features :
    Yes (4)
  • Free Spins/Multiplier:
    NA/NA
  • RTP %:
    96%
  • Max Win:
    4,035 x
Review by Chris Taylor

Review by Chris Taylor

Chris is a slots expert that has reviewed and played over 4,000 online slots. Having being in the iGaming industry for over 16 years, he knows how slots work, how bonus features are triggered and how the RTP and variance affect the gameplay.