Fire in the Hole 4

Fire in the Hole 4: Slot Overview

A lot of casino game makers do the mining thing; some stay longer than others. One studio which can't get enough of dark, dank, grimy underground grottos is software producer Nolimit City. The studio has led players below the dirt in a number of underground slots such as Dead Canary, Misery Mining, and famously, its Fire in the Hole series. Started in 2021, Fire in the Hole xBomb blasted its way into the rock face with the latest xMechanic, the xBomb, and a wild swinging battle axe of a bonus round known as Lucky Wagon Spins. It went down well, motivating the studio to later release Fire in the Hole 2, then Fire in the Hole 3, and has now dropped the latest in the line, Fire in the Hole 4, a follow-up which adds new effects to go with a reworking of the infamous bonus round.

Part 3 has thawed, letting our favourite dwarf escape the frozen wasteland, with, randomly, a bear on his back. He's also left his brother far behind, or so he thought… The new adventure is jungle-based, deep jungle at that, where a mine entrance hosts the base game. Trigger the bonus feature, and play moves to the sort of rocky environment Fire in the Hole is most comfortable in, that is, deep underground in a dark, dank grotto, where nuggets abound, and dwarves can do their mining business. Like the three slots which preceded it, Fire in the Hole 4 has a heavy clanking feel to it as pulleys raise and lower stuff, rats scurry, and fortunes may potentially be found in the darkness. Or not, it is a brute of a game after all, as these Fire in the Hole releases tend to be.

The game is played on a 6-reel grid with up to 6 rows and 46,656 ways to win. The previous Fire in the Hole slots have been highly volatile, so it stands to reason Fire in the Hole 4 is as well. It's got a default RTP of 96.01%, and a stake range of $/€0.20 to $/€100.

The regular paying symbols are 10-A royals as the lows, then gloves, grappling hooks, picks, cheese, and pans of jewels as the high pays. A royal 6 OAK win pays 0.5x-0.75x the bet, and a 6 OAK premium symbol win pays 1x-2.5x the bet. Wild symbols, whatever the type, replace regular paying symbols. Wilds have the same payout value as the top-paying symbol.

Fire in the Hole 4: Slot Features

Fire in the Hole 4's features are collapses, Lucky Nugget Spins, xBomb Wild Multipliers, xWays & Infectious xWays, Wild Mining, buried features, xSplit, Nolimit Boosters and bonus buys.

Collapsing Waterfall

Each spin begins with 3 active rows. For each collapse, an additional row becomes active up to a maximum of 6 rows. A new collapse can be triggered by a winning combination, an xBomb Wild explosion, or the Wild Mining feature triggering. Winning symbols are paid out and removed before the next collapse, which causes symbols to drop down, leaving empty positions for new symbols to fall into from above.

Lucky Nugget Spins

Landing 3 or more scatter symbols triggers Lucky Nugget Spins. It is played on a grid with 4 active rows, Collector Chests at the bottom, and an Upgrade Reel to the right. The round starts with 3 spins, which reset to 3 each time a Nugget lands on the reels. Nugget and Dwarf values are multipliers of the bet. Each spin reveals Enhancers on the top row, which activate when a Nugget lands beneath them. Nuggets and Dwarfs move down one position on each spin until they are collected in the Collector Chests.

The Upgrade Reel may contain random multipliers of x2 to x100, which multiply all Nugget and Dwarf values on their row when they land on an unlocked position. Each position is locked with 1, 2, 3, and 4 locks, activated when all locks on the position are removed. One lock is removed by each triggering scatter or by Dynamite during the feature. These enhancers may appear on the top row:

• Nugget values - Set the value of the Nugget.
• Multipliers - Multiply all Nuggets on the reel below the enhancer.
• Dynamite - Adds the Dynamite count to the triggering Nugget, then throws as many Dynamites as its count onto the grid. If it lands on a Nugget or Dwarf, it doubles its value. If it lands on the Upgrade Reel, it removes a lock from the locked position.
• Dwarf - Transforms the triggering Nugget into a Dwarf and collects all values on the grid.
• Freeze Cell - Adds its count to the triggering Nugget. Nuggets and Dwarfs on the grid lock on their positions for the number of Freeze spins awarded.
• Evil Dwarf - Removes the triggering Nugget and randomly multiplies Collector Chest positions by x1 to x5.

xBomb Wild Multiplier

xBomb Wilds substitute for any symbol except scatters. Exploding xBomb Wilds remove all symbols in their row and column (except scatters), increasing the win multiplier by +1 for the next collapse. After exploding, the xBomb transforms into an xBomb Wild, xWays, Infectious xWays or a regular pay symbol. xBomb Wilds explode before the next collapse, except during the Wild Mining feature or when revealed by another xBomb.

xWays & Infectious xWays

xWays and Infectious xWays can be revealed from an xBomb Wild. xWays transform into a normal pay symbol 2-4 in size. Infectious xWays transform into a regular paying symbol 2-4 in size and infect all occurrences of that symbol on the reels, turning them into size 2-4. If there is more than one Infectious xWays, they do not affect each other.

Wild Mining

Wild Mining triggers in the main game when 3 to 6 of the same kind of symbols align horizontally or vertically, and there are no winning combinations or active xBomb Wilds. The triggering symbols are removed and create wild symbols in the middle positions of the alignment - 3, 4, 5, or 6 symbols award 1, 2, 3, or 4 wilds, respectively. All positions above the bar, except for scatters and Dirt Buried symbols, explode, triggering a collapse. Dirt Buried symbols are revealed and become active with the collapse.

Buried Features

Dirt symbols in the main game may contain xBomb Wild, xSplit or scatter symbols. Feature symbols buried in dirt are inactive until the dirt block they are in is removed or is hit by an xSplit or xBomb feature.

xSplit

An xSplit symbol splits symbols on its row and column, doubling the symbols. xSplit symbols cannot be split. When all xSplit symbols have activated, they turn into regular pay symbols. Dirt blocks affected by a split are removed if there is a collapse. If xSplit is revealed from a Dirt symbol, it triggers on the next avalanche.

Nolimit Boosters & Bonus Buys

The Bonus Booster costs 2x to guarantee 1 scatter, while the Dirt Bonus Booster costs 5x to guarantee at least 3 scatters in dirt blocks. Reels Booster costs 8x to activate all 6 rows. It is possible to buy Lucky Nugget Spins for 60x to 500x, and Lucky Draw for 248x. Further bonus buys are:

• Guaranteed Dwarf & Nuggets - Awards Lucky Nugget Spins with all Upgrade Reel positions unlocked, and a guaranteed Dwarf in the top row on every spin, plus a full row of Nuggets on the first spin. The cost is 1,500x.
• Guaranteed Dwarf - Awards Lucky Nugget Spins with all Upgrade Reel positions unlocked, and a guaranteed Dwarf in the top row on every spin. The cost is 800x.
• Guaranteed Evil Dwarf - Awards Lucky Nugget Spins with all Upgrade Reel positions unlocked and a guaranteed Evil Dwarf in the top row on every spin. Costs 650x the bet.
• Guaranteed Random Dwarf - Awards Lucky Nugget Spins with all Upgrade Reel positions unlocked and a guaranteed Dwarf or Evil Dwarf in the top row on every spin. Costs 1,000x.

Fire in the Hole 4: Slot Verdict

Fire in the Hole 4 is another chonk of an addition to Nolimit City's popular mining range, bringing back the rock-breaking mayhem while introducing new mechanics to push the series in a different direction. Instead of simply building on the Lucky Wagon Spins round, the developer has replaced it with Lucky Nugget Spins, rejigging the experience to trigger emotional responses in a way that differs from the past. The round centres on hitting Nuggets or Dwarves, which drop their way down to bottom row Collector Chests, rather than lock in place as before. Along the journey down, there are numerous ways of upgrading values, including chest values, which is where the magic, or the torture, of Fire in the Hole 4, lies.

The base game's not bad either, as Nolimit City has consistently added more and more features to this phase of play as the series has progressed. What's new this time are the xWays and Infectious xWays features, and by new, we mean new for Fire in the Hole, as both are staple xMechanics the studio has utilised in a number of previous slots. The xSplit is stronger this time, too, able to split symbols on its reel and row, and it is possible to get some nice interaction of features happening in the base game when the sack of modifiers are unleashed, from splitting, xWaying, bombing, mining, all that good stuff. Still, the main event is those Lucky Nugget Spins, and while the changes have altered how the bonus unfolds, it's not obviously superior to Lucky Wagon Spins. Different for sure, and potent too, since Fire in the Hole 4 has the highest potential so far with a max win of 75,000x the bet. There was just something about the way Collect Chests would collect coin values on every spin in Lucky Wagon Spins which is missing from Lucky Nugget Spins, but that's not to say Fire in the Hole 4 can't fill the wagon with its modifiers when the dig's going good.

Fire in the Hole 4 hasn't abandoned the ingredients that made the series popular in the first place, but its impact has slightly decreased considering we're four slots deep and all. Still, this is a game that feels familiar enough to appeal to returning fans, yet different enough to avoid being just another trip down the same old shaft. Whether the new Lucky Nugget system proves more enjoyable than Lucky Wagons will largely come down to personal preference, but Nolimit City has at least given its favourite dwarf another interesting adventure to get himself into trouble with.