Champion of the Underworld (Yggdrasil Gaming) – Review & Demo Play

Champion of the Underworld Slot Information

Champion of the Underworld is a 6x4 Yggdrasil video slot with 4,096 ways. The action takes place in Hades’ arena with heavy guitars and a crowd of lost souls. Any win needs three or more matching symbols on adjacent reels from the left. Stakes run from 0.20 to 100 per spin. The RTP can be 96.00%, but there are versions at 94%, 90.5%, and 86%, and volatility is very high. The headline payout reaches 10,000x, which fits the savage tone.

Gigablox and Wild Fight are the headline mechanics. Blocks up to 4x4 land on every spin and break down to 1x1 for win evaluation. Hades can randomly fight high-paying monsters in the base, turning them wild when he wins. The presentation leans dark rather than cute, with fire-lit reels and a pounding drum before the guitars kick in. It plays smoothly across devices. Adjustable RTP ranges deserve a mention, as not every venue runs the 96% build.

Symbols and Paytable in Champion of the Underworld

The lower-paying set is the deck suits, and six of a kind pays 0.5x. High-paying symbols are monsters, including a green horse, a blue-haired woman, a snake-haired figure, and an ox-like brute, paying 1x to 2x for six. The Wild Symbol is a grinning skull that substitutes for all except the Scatter. Free Spins Scatters are counted by size when they land as Gigablox. Multiple winning symbols on a reel can improve ways wins, which is a neat touch on a 4,096 ways layout.

Champion of the Underworld Symbols and Paytable

Symbol	Quantity	Payout
	6	x2
	5	x1
	4	x0.5
	3	x0.25
	6	x1.5
	5	x0.75
	4	x0.4
	3	x0.25
	6	x1
	5	x0.5
	4	x0.3
	3	x0.2
	6	x1
	5	x0.5
	4	x0.3
	3	x0.2
	6	x0.5
	5	x0.25
	4	x0.15
	3	x0.1
	6	x0.5
	5	x0.25
	4	x0.15
	3	x0.1
	6	x0.5
	5	x0.25
	4	x0.15
	3	x0.1
	6	x0.5
	5	x0.25
	4	x0.15
	3	x0.1
	Wild
	6	x2
	Scatter

Gigablox in Champion of the Underworld

Gigablox in Champion of the Underworld can appear as 2x2, 3x3, or 4x4 blocks on any symbol, and you see at least one block every spin. When wins are evaluated, each block is divided into normal symbols, so a 4x4 is counted as sixteen. This applies to Scatters as well, letting a single large tile push the Free Spins trigger over the line. The grid stays 6x4, so you never get a full-screen mega tile, but the regular stream of blocks keeps the rhythm lively.

Wild Fight in Champion of the Underworld

Wild Fight in Champion of the Underworld can trigger at random in the base game. Hades picks a premium symbol and battles it, and any defeated monster turns wild, including Gigablox. This can flip a spin on its head, especially when a large block falls. On my sessions, these bursts broke up dry runs and helped land chunky ways lines, though they can whiff too. The feature adds tension because any spin might ignite.

In Free Spins the same mechanic happens on every spin, which is where the ladder comes alive. I do wish the clashes had more visible action, as without reading the rules it can be easy to miss why reels changed. That gripe aside, the idea fits the setting and lines up with Yggdrasil’s earlier take on Hades fighting monsters. It is swingy by nature, since the whole thing relies on fights going your way.

Free Spins and Gamble in Champion of the Underworld

Free Spins in Champion of the Underworld trigger with 5 or more Scatters on one spin, and you receive a number of spins equal to the total Scatters. Gigablox count by size, so a 2x2 equals four. Any Scatter in the feature adds an extra spin. Wild Fight fires on every spin here, which is where the big outcomes lurk. Starting with more spins felt important for me, as the mode benefits from time to build momentum.

A progressive multiplier sits above the reels. Each successful fight adds one point to the counter. The levels are steep but clear. Nine fights reach 2x, twenty reach 3x, thirty-three reach 5x, forty-eight reach 10x, and sixty-five reach 25x. Hitting a new level also awards two extra spins. The cap is 25x and the counter stops after that. You can see why a larger starting stack of spins helps you climb.

Before the feature begins, you can gamble for more spins via a sword pick with two tiers. A golden tip grants extra spins, a broken blade wipes the lot and dumps you back into the base. You can press your luck again after a win. It is strictly for the bold, as the loss stings. I used it sparingly unless I had a middling starter, where an upgrade can make a real difference to the ladder.

Bonus Buy in Champion of the Underworld

Bonus Buy in Champion of the Underworld offers two routes. Pay 90x bet for five Free Spins or 1,000x bet for twenty. If you buy the smaller package you can still gamble for more before the round starts. The premium option is pricey but skips the risky gamble and lets you go straight at the multiplier ladder with a strong runway. I preferred using the 90x entry and taking a measured shot at improving it, depending on balance and mood.

Review Summary for Champion of the Underworld

The theme lands well. The arena of souls looks the part, and the heavy metal soundtrack ramps up the action, though it can get repetitive after a while. Gigablox arriving every spin keeps the base game varied, while random Wild Fights add surprise spikes. The math is very high variance with a 10,000x ceiling, which feels fair for the feature set. Adjustable RTP ranges are the caveat, so I always check the version on offer.

As for gameplay, the free spins ladder is the heart of it. When Hades chains wins and the meter climbs, it feels brilliant. On the flip side, fights can fizzle and upgrades can feel far away. Starting with a bigger batch of spins helps a lot, either from a chunky trigger or by taking the gamble. Overall, Champion of the Underworld is a solid Gigablox and Wild Fight outing that suits players who enjoy bold swings.