- A 6×6 cascading cluster slot from Bullshark Games, starring two bear brothers who blow things up
- Fire and Ice Power Bombs that add cell multipliers or matching symbols to the grid
- Two bonus games where multipliers do not reset, and a max win of 12,000x the bet
Boombear Bros is a Bullshark Games slot released on 23 September 2026. Two bear brothers who are experts with explosives throw bombs onto a 6×6 grid, set out on the frozen tundra.
Bullshark sums it up with the line that the tundra has never seen a heatwave like this, and that is a fair picture of the game: a cold, quiet setting with a lot of noise and fire on the reels.
Grid, Cascades and Wilds
The game uses a 6×6 grid and pays in clusters, so there are no paylines. Every win sets off a cascade. The winning symbols are cleared, new symbols drop in to fill the gaps, and any new wins are paid before the next cascade. This goes on until there are no more wins on the grid.
The Wild symbol stands in for all the paying symbols. It can land on its own in the base game and the bonus games, and it can also be added by the Ice Bomb, which we cover below.
Cell Multipliers
Each cell on the grid can hold a multiplier, but they start empty. The only way to add or increase a cell multiplier is with a Fire Bomb.
When a win includes a symbol sitting on a cell with a multiplier, that multiplier is applied to the win. If the win covers several cells with multipliers, their values are added together first and then applied. In the base game, multipliers carry on growing through all the cascades of a spin, but they reset at the start of the next spin.
Power Bombs
Power Bombs are the heart of the game. Each one has a random direction and a random length, and these decide the size of its blast:
- Horizontal: the blast travels left and right
- Vertical: the blast travels up and down
- Cross: the blast travels in all four directions
The length sets how many cells are hit in each direction, from 1 up to 5. A blast cannot go past the edge of the grid, so a bomb that lands near the side or the top may reach fewer cells.
RECOMMENDED CASINOS TO PLAY Boombear Bros
Fire Power Bomb
When a Fire Bomb lands, it adds a multiplier to every cell inside its blast, including the cell it landed on. The possible values are 2x up to 10x, plus 15x and 20x. Every cell hit by the same bomb gets the same value.
Several Fire Bombs can be on the grid at once. They go off in order, from left to right and top to bottom, and each one has its own value. Where two blasts hit the same cell, the multipliers are added together. After it goes off, the bomb itself turns into a random paying symbol or a Wild.
Ice Power Bomb
The Ice Bomb works in a different way. It waits until the grid has settled and there are no more wins, then it fills the cells in its blast with matching symbols. These can be any symbol from the paytable, including the Wild.
Other bombs, Wilds and FS Scatter symbols are not replaced. If more than one Ice Bomb is on the grid, they all add the same symbol type, although each bomb decides on its own whether to add Wilds. The bomb then turns into the symbol it added. With a big cross blast, an Ice Bomb can create a large cluster in one go and start a new chain of cascades.
Bomb Frenzy
Bomb Frenzy is a mystery event that can save a dead spin. On any spin with no wins and no Power Bombs, it may trigger at random and add 2, 3, 4 or 5 bombs to the grid. These can be Fire Bombs, Ice Bombs or a mix of both.
Bombs Away and Maximum Blast
There are two bonus games, and the number of FS Scatter symbols decides which one you get:
- 3 FS Scatters start Bombs Away with 10 free spins
- 4 FS Scatters start Maximum Blast with 12 free spins
Both keep the base game mechanics, with one big change: cell multipliers no longer reset after each spin. They keep building until the bonus ends, which is where the big wins come from. Multipliers from the spin that triggered the bonus do not carry over, so every bonus starts fresh. Each FS Scatter that lands during either round adds 1 more free spin.
Maximum Blast has an extra twist. Every Power Bomb explodes in all four directions, so each Fire Bomb spreads its multiplier over far more cells, and each Ice Bomb has a much wider reach. Bullshark says the 12,000x max win can be reached in both bonus games.
RTP, Stakes and Volatility
The main RTP is 96.32%, and Bullshark also lists a 94.36% version, so check the game info at your casino. The volatility is rated 3 out of 5, which puts it in the middle of the range. Default bets run from €0.10 to €75. The max win is 12,000x the bet.
About Bullshark Games
Bullshark Games sets out the rules of its slots in a lot of detail on its own game pages, which makes it easy to understand how each feature works before you play. Boombear Bros is a good example, with every bomb type explained step by step. Our review of Arctic Duel covers another slot with a cold northern setting.
Overall
Boombear Bros is a lively cluster slot with a simple idea done well. The two types of bomb do very different jobs. Fire Bombs build up cell multipliers, while Ice Bombs fill the grid with matching symbols to create new clusters.
The base game has plenty going on, and Bomb Frenzy helps on spins that would otherwise be empty. The real draw is the bonus games, where multipliers stick around for the whole round. Maximum Blast is the one to hope for, since four-way blasts can cover large parts of the grid.
With volatility rated 3 out of 5, it is not as harsh as some cluster games, but the 12,000x max win still gives it plenty of upside. It is a good choice for anyone who enjoys watching a grid build up from one cascade to the next.