Giga Zombies Gigablox

Giga Zombies Gigablox is a 6x5 slot from Yggdrasil, released on 18 May 2026, with an RTP of 94.00%, high volatility and a ceiling of 6,260x the stake. It uses the studio’s Gigablox engine, and it does not pay by lines at all.

A Temple, Overrun

The grid stands in a green-lit jungle clearing in front of a ruined stone temple, with two zombies half-buried in the undergrowth at the bottom corners and a treasure hunter in a slouch hat firing a revolver over the top of the reels.

The symbols are zombie heads in four colours – red, purple, green and blue – over the usual card ranks. When the free spins start the whole scene switches to a red-lit crypt, which is a considerably better way of signalling the mode change than a counter alone.

It Pays By Count

The paytable is the thing to understand before anything else. There are no lines and no ways; symbols pay on how many of them are on the board, in bands from 8 up to 15+.

At the $100.00 bet the capture was taken at, the red zombie pays $2,500.00 for 15 or more, $1,500.00 for thirteen or fourteen, $1,250.00 for eleven or twelve, $1,000.00 for ten, $600.00 for nine and $500.00 for eight.

The purple runs $1,500.00 down to $125.00, the green $1,000.00 down to $100.00, and the blue $750.00 down to $75.00.

Converted, the best single result the paytable allows is 25x the stake – fifteen or more red zombies on a thirty-cell grid. That is the whole of the base game’s potential in one number, and it explains why the 6,260x ceiling has to be built somewhere else.

Notice too how the bands are grouped in pairs: thirteen pays the same as fourteen, eleven the same as twelve. The eighth and ninth symbols are worth having; the twelfth is not, unless it takes you to thirteen.

Eight matching heads out of thirty cells is the entry price, and the four zombie colours have to share the board with four card ranks, so a paying count is less common than the low threshold suggests. When it does happen at the bottom of the table – eight blues – the return is 0.75x the stake, which is a loss dressed as a win.

The Giant Blocks

Gigablox is Yggdrasil’s house mechanic, and it works by dropping symbols in as blocks that cover several cells at once – 2x2, 3x3 and larger. On a paytable that counts symbols rather than lines, a single 3x3 block is nine of a kind on its own.

That is the connection between the two halves of this game: the giant blocks exist to push you over the counting thresholds, and the thresholds exist to make the blocks worth something.

The Bar Above The Reels

A narrow strip runs across the top of the grid carrying three markers – GIGA BLOX, WILD and FREE SPINS – with arrows pointing between them. It is present on every base-game capture, tracking progress towards each of the three.

Yggdrasil does not label what fills it, but the arrangement is telling: the Gigablox marker sits before the wild, and the wild before the free spins. The three awards are ordered by value, and the bar is the game showing you which one is next rather than leaving it to chance.

What The Base Game Returns

Three screenshots catch a paid base spin at the $100 bet: $50.00, $150.00 and $250.00. That is 0.5x, 1.5x and 2.5x the stake – eight or nine matching heads scattered around the grid, nothing more.

The third of those also shows three FREE SPINS symbols landing down the left of the board, which is what takes you into the crypt.

Across those same captures the balance falls from $10,800 to $8,160 – roughly twenty-six spins of ground lost while three of them were paying. That is the honest picture of the base game: it pays often enough to keep the screen busy and not nearly often enough to hold the balance steady.

The Multiplier Ladder

The free spins screen replaces the progress bar with a ladder of eight values: x2, x4, x6, x8, x10, x15, x20 and x50, with a +FREE SPINS box at the end of the row.

The active rung is highlighted in red – x2 at the start of the round in one capture – and climbing the ladder is what the round is for. Note the jumps: the first five rungs add two apiece, then it goes 15, 20 and straight to 50. The top rung is worth more than the two beneath it combined.

One Round, Followed Through

Four captures come from the same free spins round, and read in order they show exactly how a high-volatility game of this shape actually plays.

With 12 spins remaining the round total stands at $1,500.00 and the multiplier is on x2. With 11 spins left it has reached $8,200.00, a single spin having paid $750.00. With 5 spins left the total is $26,910.00 – and another $1,000.00 spin is resolving on screen.

Against the $100 stake that is 15x, then 82x, then 269x, with five spins still to play. The money in this game does not arrive gradually; it arrives once the ladder has been climbed and the giant blocks start landing on a board that pays by the headcount.

94% Again

As with its Western stablemate, the published RTP is 94.00% – two points below the market standard, and the single most important number in this review.

What you are buying for that extra house edge is a genuinely explosive bonus round: a 269x running total with five spins left is not something a 96% game hands out often. The volatility rating is high, and the gap between a 0.5x base spin and a 269x round is the clearest illustration of it you could ask for.

Who It Is For

This is for players who like cluster-style counting games, understand that the base game is a waiting room, and want a bonus with a visible ladder to climb. The Gigablox blocks landing on a count-based paytable is a genuinely well-matched pairing, and the crypt is a fine piece of staging.

The reservation is the same 94% and a base game whose best possible result is 25x the stake. Everything here depends on reaching the free spins, and the return figure means you will pay for the privilege of waiting.

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