Fire in the Hole 4 Bonus Buy and Lucky Nugget Spins

The bonus is where Fire in the Hole 4 makes or breaks a session. Nolimit City rebuilt it for the fourth game: the old wagon round from Fire in the Hole 3 is replaced by Lucky Nugget Spins, a collect-style feature with an Upgrade Reel that starts locked. On top of that, the game offers one of the widest bonus buy menus in the studio's catalogue. Here is how all of it works, with the official prices from the Nolimit City game sheet.

How to trigger Lucky Nugget Spins

Land three or more Bonus symbols anywhere on the board in the base game. Bonus symbols can arrive in three ways:

• they drop in naturally during a spin or a collapse;
• they are uncovered from dirt when a collapse or an explosion removes the dirt above them;
• an xSplit next to a Bonus symbol turns it into a Super Scatter, which gives a stronger start to the round.

On average the bonus triggers once every 205 spins. The number of Bonus symbols on the trigger matters a lot, because each one removes a lock from the Upgrade Reel. More on that below.

How Lucky Nugget Spins works

The bonus plays on a separate board with four active rows. The parts of the board:

• Collector Chests along the bottom row. They collect the value of everything that reaches them.
• The Upgrade Reel on the right side, with multipliers of x2, x3, x5, x10, x25 and x100.
• The top row, where enhancers enter the round.

You start with three spins. Every time a Nugget lands, the counter resets to three. The round ends when you run out of spins without a new Nugget. Nuggets and Dwarfs fall one row each spin until they reach the chests and are collected.

The Upgrade Reel and its locks

Each position on the Upgrade Reel starts behind one to four locks. While a position is locked, its multiplier does nothing. Two things remove locks:

1. every Bonus symbol that triggered the round removes one lock;
2. every Dynamite that lands during the round removes one lock.

So a trigger with five or six Bonus symbols starts the round with much more of the reel open than a trigger with three. You can check this in the demo: compare a round that starts with three scatters with one that starts with five.

Enhancers on the top row

Dwarf vs Evil Dwarf

The two dwarfs are the heart of the new bonus. The Dwarf is steady: it turns a Nugget into a collector that picks up values as it falls, so an early Dwarf can grow into a large payout. The Evil Dwarf is a gamble: it destroys a Nugget, then multiplies the chest positions by a random x1 to x5. An x1 is a pure loss, but an x4 or x5 on full chests can turn an average round into a big one. This trade-off is why the bonus buys are split by dwarf type.

Bonus buy prices

These are the official options listed by Nolimit City. Prices are multiples of your base bet.

At different stakes:

Some review sites also list a 15x buy that guarantees six xBomb Wilds. It does not appear on the official game sheet, so we leave it out until Nolimit City confirms it.

Boosters for the base game

Boosters are activated per spin and multiply the cost of each spin. They do not buy the bonus directly; they change what lands.

The Reels Booster is interesting for base-game fans: you skip the slow start at 729 ways and play every spin on the full 46,656-way board. The Dirt Bonus Booster is the closest thing to a cheap bonus buy, because three buried Bonus symbols only need the dirt cleared to trigger the round.

Which bonus buy should you choose?

There is no "best" buy. Each option trades price against variance. Some practical guidance:

• Guaranteed Evil Dwarf (650x) is the cheapest and the swingiest. Many rounds will return less than the price, while a few big Evil Dwarf multipliers carry the average. It suits players who accept losing most buys.
• Guaranteed Dwarf (800x) is steadier. Dwarfs keep collecting, so results cluster closer to the middle.
• Guaranteed Random Dwarf (1,000x) mixes both. You pay more for variety, not for a clear edge.
• Guaranteed Dwarf & Nuggets (1,500x) starts with the whole Upgrade Reel open and a full row of Nuggets. It has the strongest start but the highest price, so it needs the biggest result to break even.

Nolimit City does not publish a separate RTP for each buy. Do not assume that a more expensive buy returns more per euro spent. Before spending real money on any of them, buy each option 10 to 20 times in the free demo to see the range of results.

Bonus buy and budget

Bonus buys burn money quickly. A €200 budget at a €0.20 bet covers only one 1,000x buy, while the same €200 gives about 1,000 normal spins. If you buy features, decide in advance how many buys you will make and stop there. Never raise the base bet to "win back" a bad buy.

Bonus buys are also not available everywhere. Some countries ban them, and some casinos switch them off. Check the casino before you deposit; our where to play page explains how.

Base-game features that feed the bonus

Lucky Nugget Spins does not happen in isolation. Several base-game features raise your chances of a strong trigger:

• Collapsing Waterfall opens up to six rows, giving more space for Bonus symbols to land.
• xBomb Wild explosions clear dirt in their row and column, revealing buried Bonus symbols.
• Wild Mining blows up lines of identical symbols and starts a new collapse, which is another chance to uncover dirt.
• xSplit next to a Bonus symbol creates a Super Scatter.

The mechanics and their numbers are covered on the main Fire in the Hole 4 page, and the RTP side is on the RTP and max win page.

Bonus buy FAQ

15.11.2026