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Steam Tower slot from NetEnt

Steam Tower slot from NetEnt
In 2015 NetEnt released the Steam Tower slot machine - a steampunk fantasy slot, which combines Victorian-era technology with a dragon, a damsel in distress, and a 19th-century hero. All the action takes place on a 16-floor tower, which you have to climb to rescue the helpless damsel from a ferocious red dragon. This adventurous 5x3 slot with 15 pay lines features great graphics as usual and a cinematic orchestra accompanying you while you spin the reels. 

This Medium Volatility slot with an RTP of 97.04% is waiting for you to be the noble hero! On our site, you have the opportunity to check the game for free in the DEMO version. No registration is required.

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Personal testers’ opinion about Steam tower slot

Bonus hunters better beware of this slot. It has middle range points - 5.92 out of 10. Moreover, it doesn’t keep the balance perfectly all the time. Either it is on fire, or it takes your money away in a blink of an eye. The full potential of the slot can be realized only at a very long distance. Statistically, the Free Spins feature is triggered every 77th spin (1.30%). Our average payout was around 37x during this feature, which is peanuts, probably because 54% of the prize pool is reserved for the regular spins. 

Review and recommendations by the testing team

  • The Steam Tower slot machine is one of NetEnt’s most peculiar slots, deserved by the reputation of how well it is managing to keep the balance (which is not entirely true). So, the slot is always in demand as bonus hunters and players who play with real credits prefer it. But, on the other hand, online casino owners often put it on the exclusion list (of forbidden slots) for wagering the bonus money.
  • In the base game, winning combinations are rewarded constantly, which gives the impression that the slot keeps the balance well. But don’t be fooled; most of these payouts are smaller than your bet. Also, like many other slots, it rarely issues expensive combinations, so when you look at the base game separately, it doesn’t live up to its reputation of keeping the balance well at all.
  • Something we often see in other slots, teasing with Free Spins and almost rewarding them (but then don’t), doesn’t occur here too often. In fact, Free Spins are launched every 77th spin, which is one of the highest frequencies among slots in general. We established that Free Spins are activated in series with small intervals during our extensive testing, and when they were over, we had to wait for the next series for about 300 spins. The winnings from them are usually not so amazing. 5OAK featuring a top symbol only happened occasionally and getting to the 16th floor is virtually impossible. Every 20-25 bonus rounds, this might actually occur.

We grasp the worth and the originality of the bonus round gameplay. Here is how the Free Spins process goes

  • 10 Free Spins are rewarded when you land full-stacked Wild symbols on the reels during the main game. To get to the next floor, all you need is 1 Wild symbol to appear anywhere on the reels. Besides increasing the multiplier (up to 7x), the Wild symbol also gets you 2 additional Free Spins.
  • Once you climbed all the way up to the 16th floor of the steam tower and save the damsel in distress, you will be rewarded an additional prize: 1000 coins multiplied by the bet level.

Hidden parameters and settings of Steam Tower slot (data from testing)

  • The frequency of triggering out of the free spins feature is statistically every 77th spin (1,30%).
  • The probability of a hit (any winning) is 32,44%.
  • The distribution of the winnings is 54% in the main game and 46% in the free spins feature.
  • The maximum winning during the tests was 434x.
  • The average winning from the bonus was 37x.
  • Volatility is 4,95 out of 20 (average).
  • The length of the cycle is average.
  • The rating of the slot machine for the wagering is 5,92 out of 10.
  • RTP of 97.04% allows you to get the positive mathematical expectation of winning at the casino.


  • Number of reels - 5
  • Number of pay lines - 15 (always active)
  • The cost of one coin is from 0.01 to 1
  • Number of coins per line - from 1 to 10
  • The range of bets - from 0.15 to 150
  • The maximum winning is 300,000 coins
  • Wild symbol - yes
  • Free spins - yes

How to win at the Steam tower slot machine? (Conclusion)

  • We will start with our usual headline, to always test the slot in the DEMO version before investing real money. 
  • Being in the middle line for wagering, this is not the best slot for bonus hunters.
  • Considering playing with real money, the slot requires a ‘smart’ game strategy. 
  • Start with a bet balance of 150x-200x bets and test the game to see if the Free Spins are triggered. 
  • Steam tower slot machine clearly shows at what a stake ‘likes to be played.’ So if you identify the stake at which you often get the Free Spins, you need to continue playing via that stake. 
  • The waviness of the winnings will help you to secure the bonus round or increase the balance. However, if there are no Free Spins anymore in the next 50 spins, it might be time to move on. 
  • If the slot machine does not give Free Spins at all, there is no point in going through the whole cycle. So instead, just go to another slot. 
  • Besides the excellent graphics, the original Free Spins feature, and the exhilarating soundscape, there is one more important feature: the 97.04% RTP. All these elements make the slot enjoyable and worth a spin or two.

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Written by Kamen Valev
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