boom brothers

Boom Brothers is a 5-reel, 3-row video slot from NetEnt that sends two gnome miners deep underground in search of buried treasure. Released in 2013, it runs on a low-volatility math model across 20 fixed paylines, which keeps the base game paying out more consistently than most NetEnt titles of its era. What sets it apart from the rest of NetEnt’s mine-themed catalog is the standalone Trolley Bonus, a pick-and-win side game that triggers independently of the main reels and gives Boom Brothers a second, distinct way to land a prize on top of its free spins round.

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The Bomb symbol works as Boom Brothers’ wild, substituting for every regular pay symbol on all 20 paylines to help complete combinations. Landing three or more Barrel scatter symbols anywhere on the reels awards 10 free spins, and the round can retrigger for additional spins if more scatters land during the bonus. The game’s standout feature is separate from both of those: three or more Trolley symbols send the reels to a dedicated mine-cart bonus screen, where each cart conceals an instant cash prize picked one at a time until a “collect” cart ends the round. Because that bonus runs independently of the paylines, it gives low-volatility spins an extra, faster-paced way to land a win without waiting on a big free-spins streak. That combination of a mine-cart side game and a standard scatter-triggered bonus gives Boom Brothers two separate payout paths running alongside its steady base-game hit rate.