Champions of the Underworld Gigablox Slot Review

Champion of The Underworld Slot Review

Play for real
Editor's Rating
Release Date October 6, 2022
Maximum Win €1,000,000
Max RTP 96%
Default Bet size 2 €
Bet Range €0.2 - €100
Lines 4,096
Volatility Super High

Yggdrasil’s Underworld’ series is back with another instalment in the shape of Champion of the Underworld! Join Hades and the crew of mythical beings and play for wins up to 10,000x in this epic adventure. Try the demo in our full Champion of the Underworld Gigablox slot review….


Champion of the Underworld Gigablox challenges you to find the bravery to return to the depths of the Earth and take your chance to spin the reels of Champion of the Underworld! Inspired by the mythical stories of Hades and other famous faces, this is the next instalment of Yggdrasil’s ‘of the Underworld’ series, where Hades will expect you on his arena alongside four brand new monsters, where two of Yggdrasil’s coveted GEMs, GIGABLOX™ and Wild Fight™, will be put into action. As expected, this game looks and sounds incredible, with top class arcade animations and graphics, running along side these cool slot bonus features. As you spin the underground arena machine and obtain high paid symbols, some will transform into Wilds, increasing your victories and sending the machine’s vibe to another level. The GIGABLOX™ mechanic will also make the payout even more spectacular, before the featured Free Spins mode will be further intensified by every Wild symbol. This is an ace game from Yggdrasil, perfect if you want to let off some steam in fight mode!

Play for Free

Grab some rounds on the Champion of the Underworld Gigablox slot demo before spinning at a real money casino.

Houston, we have a problem!

Unfortunately the Free Play option is temporarily suspended in your country due to UKGC compliance.

In the meantime, feel free to play the game for real at one of our top casinos listed below.


You must be 18+ to play slot games

Confirm age

Play for Real

50 Free Spins on Starburst

+ 100% Deposit Match Bonus Up To £100

T&Cs apply. New reg only. Opt in & deposit £10, £25 or £50 within 7 days & further 7 days to wager cash stakes 35x to unlock reward (£50 on 2 deposits). 3 day exp. Wagering/game contributions vary. 25 wager-Free Spins x10p to added to Starburst with each qualifying deposit, 3 day expiry. 18+

100% bonus

+ 50 Free Spins on Book of Dead

The 50 Free Spins will be distributed over the course of 5 days (10 per day for the following 5 days after you claim your Welcome Bonus). You will find 10 fresh Free Spins on a different game every day from 12:00 CEST in your account in the Rewards Section. Simply log in and claim them within 24 hours for your extra chances of winning.

100% up to €1000/ £100

+ 300 free spins on Starburst

18+ Full T&C’s Apply. New players Only. £10 min deposit. £5 max bet using bonus. 40x wagering applies. Bonus valid for 14 days. 30 Spins will be credited instantly upon qualifying deposit + then 30 per day for 9 days on Starburst. Free Spins valid for 72 hours from credit. Max Free Spins winnings £100. Ewallets excluded. –

UK: 100% bonus up to £25 - ROW: up to 300€

20 Bonus Spins

18+. New UK customers only. Opt-in required. 20 Bonus Spins on “Book of Dead” and 100% Deposit Bonus up to £25 on first deposit. Min deposit £10. 30x wagering requirement for Bonus Spins and 30x wagering requirement for Deposit Bonus (game weighting applies). Max £5/spin or £0.50/line or £10/round (live casino). 30 days expiry. T&C’s Apply. Please gamble responsibly •• • Bonus terms

50 Spins on Starburst

ROW: 100% bonus up to €500 + 20 free spins!

18+. New depositors only. UK residents only. Minimum deposit £10. Free Spins are valid only on Starburst and expire in 7 days. 10x wagering apply. Certain deposit types are excluded. T&Cs apply.


Champion of the Underworld Gigablox was launched in October 2022 and has gone down extremely well with fans of Yggdrasil’s previous Underworld slot releases. This time around you can select a betting range from €0.20 – €100 and spin backed-up by an RTP of 96% and 25.76% average base game. The game is super high on volatility, so it makes a good pick if you like plenty of adrenalin and variation in your slot gaming; the trade-off could be very hot runs and big win potential.

Payouts in Champion of the Underworld Gigablox Slot

Champion of the Underworld Gigablox’s base game creates wins when you match 3-6 icon combinations of the Red beast, Purple beast, Blue beast, Green beast, Heart, Diamond, Club, Spade, and Skull wild.

Take a look at the Champion of the Underworld paytable, with rewards from x0.1 to x2:

Symbol3 Symbols4 Symbols5 Symbols6 Symbols
Red beastx0.25x0.5x1x2
Purple beastx0.25x0.4x0.75x1.5
Blue beastx0.2x0.3x0.5x1
Green beastx0.2x0.3x0.5x1
Skull wildx2


When you enter the Champion of the Underworld Gigablox slot bonus rounds, rewards can go as high as 10,000x the selected bet level. This max win pays-out between €2,000 on the lowest spin of €0.20, all the way to theoretical €100,000,000 on a max €100 bet. While the higher bet levels are very unlikely for virtually all regular slot players, it illustrates the power of the slot nonetheless.

Champion of the Underworld Gigablox Strategy Tips

Champion of the Underworld Gigablox slot can be approached using some simple tips to try and boost your value, extend your slot session and hopefully tap-in to some golden runs of luck and rewards. If you can extend your bankroll, then the prospects for more bonus rounds should logically rise too:

  • Think about playing with a maximum loss limit in each session
  • Play Champion of the Underworld Gigablox rounds with the same bet size (e.g. 0.20 per spin)
  • Aim for 100+ spins from your session bank


Scroll through our Yggdrasil Casino reviews and links to select a top site to play games like Champion of the Underworld Gigablox. Take a look at the Champion of the Underworld bonus features before you try it:


When you enter Free Spins mode, you can choose to Gamble for even more Free Spins – but be aware that losing the Gamble means forfeiting the Free Spins session. The Gamble feature is based on a Sword Drawing Game; choose one sword out of ten. The golden sword gives a win and the broken one gives a loss. There are two gamble levels that you can switch for each gamble game, depending on your risk:reward preferences.


When you spin-in at least five Free Spins symbols, the Free Spins mode with Multipliers starts. The machine and game background changes to match the special mode of the game. The Wild Fight feature triggers in each spin in Free Spins mode giving you even more winning win potential, further boosted by the special Multiplier. Free Spins mode Multiplier is charged by each Wild symbol which can increase even to x25 and the Multiplier is retained and charged during whole Free Spins mode!


The Scatter symbol is the Free Spins symbol, with 5+ Free Spins symbols triggering the Free Spins Mode. Each Free Spins symbol is worth +1 Free Spin. Scatter symbol can also be a Gigablox symbol!


In Free Spins, the winning Wild Fights accumulates Multiplier Progress points. When your accumulation is sufficient, the Multiplier increases, boosting all your wins in the bonus round. Up to x25 Multiplier can be reached!


If you want to up your bet and take a risk, you can enter the Free Spins mode instantly. You can choose either to start with five Free Spins or 20 Free Spins.


Yggdrasil’s unique Gigablox mechanic is back again in Champion of the Underworld. On each spin, two or more reels will connect each other to create at least one giga reel. As a result you can benefit from super-sized Gigablox symbols of 2×2, 3×3 or even 4×4 in magnitude (including the Free Spins symbol!). Once the reels stop, all Gigablox symbols are split into individual symbols, giving you more winning possibilities.


The Wild Fight is another Yggdrasil mechanic designed to give a you more Wild symbols. Randomly, the Wild Fight feature will launch and Hades will fight against each High symbol on the machine. If he wins, the given symbol turns into Wild symbol. During Free Spins mode, every spin activates a Wild Fight feature!


  • Where Can I Play Champion of the Underworld Gigablox Slot? Arrow

    Champion of the Underworld Gigablox slot is a 2022 slot machine from Yggdrasil. Here at Yggdrasil Casino our casino reviews will lead you to the best quality online casinos and slot sites, letting you play games like Champion of the Underworld in style.

  • What is the theme of Champion of the Underworld Gigablox Slot? Arrow

    Champion of the Underworld Gigablox slot is the latest release in Yggdrasil Underworld slot series. This time around, your mission is to go below the earth's surface and enter the real of Hades, where epic mythical battles await you! The theme is full of myth and magic, with atmospheric sounds, animated fights and awesome bonus triggers.

  • Is Champion of the Underworld Gigablox Slot Fair And Safe? Arrow

    Yes. Champion of the Underworld Gigablox has a fair RTP of 96% and 25.76%. Super high volatility means you can expect lots of variation with the upside of hot runs and big wins if you get the right side of the luck. Play at your own level by using the right sized bet from €0.10 – €100.

  • What are the payouts in Champion of the Underworld Gigablox Slot? Arrow

    Champion of the Underworld Gigablox's has a cool line-up of symbols that payout when you spin 3-6 icon combinations of the Red beast, Purple beast, Blue beast, Green beast, Heart, Diamond, Club, Spade, and Skull wild. Rewards range from x0.1 to x2 in the base game, but can rise to huge 10,000x your bet levels if you get all the luck – a payout from €2,000 to €,000,000 depending on the bet size.

  • Can I play Champion of the Underworld Gigablox Slot with Strategy? Arrow

    Champion of the Underworld Gigablox is based on random luck, with fair gaming thanks to the machine's 96% RTP. No strategy can change the odds of the game, but by opting for a pre-defined session limit, using a consistent spin size and using a bet that supports a high volume of spins, you will support value and extend your session in search of the lucky runs!