Champion of the Underworld GigaBlox


The Champion of the Underworld slot created by Yggdrasil plays out on a 6 x 4-reel grid and comes with up to 4,096 ways to win, up to 96% RTP and a high variance level.

This game comes with a Greek mythological theme. However, it’s different from other Greek-themed slots as it pits Greek gods against some evil monsters on the reels. The gods fight inside a huge arena where there are thousands of spectators. The game is part of Yggdrasil’s Gigablox feature meaning some symbols may land as colossal icons on the reels.


The interior of a fighting arena provides the background graphics for this game. Inside this arena is where the Greek gods fight the evil monsters to determine who is the most powerful. The skulls of those who are defeated in the arena can be seen at the bottom of the screen.




6 5 4 3
A golden skull mask 4.00
A bull 4.00 2.00 1.00 0.50
A purple vampire 3.00 1.50 0.80 0.50
A skeletal female character and a horse – Alike symbols only 2.00 1.00 0.60 0.40
Playing card suits – Alike symbols only 1.00 0.50 0.30 0.20


The reel icons encountered during the gaming session include a bull, a purple vampire, a skeletal female character, a horse, and playing card suits.



  • Wild: The substituting symbol is represented by the golden skull mask.

  • Scatter: The icon which is inscribed FREE SPINS acts as the game’s scatter symbol.
  • Gigablox: When symbols land on the reels, they may do so as gigablox icons. Gigablox icons cover more than one reel position. They may cover as high as 4×4 positions at once. Note that on each spin, it’s a guarantee that at least one gigablox symbol lands.

  • Wild Fight: At random, the god Hades will appear on the reels and start fighting the evil monsters. Each monster that is defeated by Hades will transform into a wild. Even monster gigablox symbols can be transformed into wilds.

  • Free Spins Feature: Champion of the Underworld free spins feature starts when players land at least five scatters simultaneously. Note that the scatters landing as gigablox symbols are calculated by symbol size. This, therefore, means if players land a 2×2 gigablox scatter, it’s deemed that there are four scatters.

  • Multipliers: The game comes with a multiplier progress counter when playing the free spins feature. The counter increments by one after each victory for Hades during the wild fight. When the counter reaches level 9, the current win multiplier is increased to 2x and an extra two free spins are awarded. Reaching level 17 will see a 25x win multiplier awarded.

  • Gamble: An option is awarded for players to increase their free spins count once they trigger the free spins feature by playing a gamble game. Those who opt to increase their free spins count play the drawing swords minigame. Drawing a sword with a golden tip means the gamble is successful. If players lose the gamble game, however, they forfeit the previously awarded free spins.

  • Buy Bonus: Players can purchase five to twenty free spins and gain direct access to the free spins feature. To purchase five free spins, players should pay 90x the bet when they click the buy bonus button. To purchase twenty free spins, players should pay 1,000x the bet.


Witness the most epic of battles when the Greek gods take to the fighting arena to fight evil monsters on the reels. If you back the gods to win, each win they get will have ripple effects as it helps to increase the multiplier progress counter. The counter once filled in turn increases the win multiplier and awards some free spins which we found was quite easy to activate when we played it.

Overall another fabulous game from Yggdrasil so make your you have a crack on it we say.

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