Booming Games delivers a good-looking slot machine to PCs, iOS, Windows, and Android devices via some of the best online casinos. A decaying Addams Family-style house with boarded up windows surrounds the 5 reels, and you’ll see plenty of horror-themed symbols on the grid. Ghostly green playing card icons are used, plus well-designed images of spiders, cats, blood-drinking vampires, and other ghoulish creatures.
You start out with an initial 45 ways to win, but on each winning spin, extra symbol positions unlock in a series of respins. With more way unlocked, it becomes progressively easier to land winning combinations across the reels at recommended online slots sites. Once all spots are active, you enter a free games bonus round as a reward.
If you are used to playing slot machines, the straightforward control panel will be quite familiar, but even novices will have no trouble finding their way around the various buttons. Plus and Minus tabs sit to either side of the bet level controls, and you can adjust your stakes from just 0.10 to 100.00 per spin.
The Plus symbol to the side of the main spin button activates an autoplay mode that runs for as long as you want, and the ‘I’ tab opens up the paytable. This reveals how much you can win from each symbol, and how the unusual number of winning ways functions. Match 3 symbols across the 1-3-5-3-1 pattern to collect a prize, with the lowest paying icons worth 1x your stake and the most valuable returning prizes of 20x at top online casinos.
An upside-down bat is the games’ wild symbol, and it will act as any other to complete a winning sequence if possible.
A win also removes some of the images of broken windows from the grid. This expands the number of ways to win to 135, and you get a free respin of the reels. If you land another winning combination, further ways to win get added, with 405, 675, 1125, and finally 3125 ways unlocked in any series of respins. A losing spin at any point resets the reels back to the basic 45 ways.
It gets easier to line up winning combinations as blockers vanish from the reels and more symbol positions become active. If you get 5 wins in a row, and the reels fully expand to 3125 ways to win, you earn an 8 free spins bonus, which play out on the fully expanded reel set.
If you land the most valuable symbol across the full reel set you can win 4800x your stake, which equals 480,000.00 if you play with 100.00 on the triggering spin. The Horror House slot machine is a high volatility game, so be prepared to see relatively long runs of losing spins between wins, but correspondingly high-value payouts.
As an average, it pays back 96.40 for every 100.00 staked, but the high variance means that this will vary over any session. Be sure to set your stakes accordingly.
Monster-themed slots are always popular, and the Horror House is certainly an appealing addition to the Booming Games range. The various creatures look suitably scary and some of the details, such as green goo covering the title, and a spooky soundtrack, add to the overall style.
The respins with expanding reels are the clear highlight of this game. As the window blocker symbols vanish and more ways to win appear, it becomes easier to see matching symbols across the reels, so it’s not too difficult to get several respins, or even trigger the free games round.
Unleash the monsters of the Horror House slot machine on your PC or mobile at our favourite Booming Games sites. We reveal the best ones here, where the best casino bonuses are waiting for you to claim on registration.
Senior content operations specialist at gambling.com
With over 12 years of experience in online gaming, Adam has seen, played, reviewed, and tested hundreds of slot games. He is always keeping an eye out for new features, themes, and potential jackpots by testing slot games even before they are released to the market.