User rating5 / 5

Gold Factory slot from Microgaming

Gold Factory slot from MicrogamingBaron von Monocle - an adept inventor, prospector, and a skillful crackerjack searching desperately for approval for his gold experiments, waiting for a lucky break to introduce his methodologically fabricated devices, teams up with a similarly eager aficionado-geologist (whiz-kid) and begins an amazing exploration venture for manufacturing gold merchandise or possessions in all possible forms - bars, coins, art, jewelry, and souvenirs.

No, this is not a storyline of a new gold rush movie. This is the script of Microgaming released in the 2011 Gold Factory slot machine. This dynamic duo will fly with dirigibles, swim with submarines, and travel by the fastest express train to find the right ingredients and facilitate the essential production machinery.

The technical aspects of the slot are a 5x3 playing field, up to 50 adjustable pay lines, generous theoretical RTP (96.54%), and the astonishing for this Medium Volatility game jackpot of 619 000 coins (in the last level of the bonus round). We advise you to try the Thunderstruck Wild Lightning slot by Microgaming for free.

You are welcome to participate in the tests and demonstrations for shaping gold creations by playing this game for free in the DEMO mode on our site. No logins or downloads are required.

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Personal testers’ opinion about Gold Factory slot

  • Besides the mentioned elements here, you can enjoy the wonderful visuals (design, graphics, and animations), the optimistic soundtrack and encouraging sounds plus narrating, and last but not least, the multi-level bonus round. So, all that seems at first glimpse standard and typical is actually pure gold for Microgaming, as this turned out to be one of their most successful online machines. 
  • Waiting for a bonus in the Gold Factory slot machine can be super lengthy for your nerves and exhausting for your bankroll. Statistically, every 209th spin is expected some bonus round. While in actuality, you just sit tight and hope for the bonus, often much longer (280-300 spins). Only 19% of the bets are reserved for the payouts of the bonuses. The probability of getting any hit (payout combination) is close to 39%, which is a good figure, which combining with the decent paytable are certainly a recipe for many successful sessions. However, we weren’t super lucky playing the golden reels. We managed to obtain only 103x the bet as a maximum of all spins, and our average from the bonus was just over 54x the bet. The slot scored 5.23 points (out of 10) on our wagering scale, i.e. right in the middle, hence, neutral advice for the bonus hunters.

Review and recommendations by the testing team

  • Our team enjoyed the steam-punk/industrial fictional design of the slot. But like with all the slots, what matters the most is the paying potential. The slot often teases with 2 Golden Bonus Coins (not enough to trigger the bonus round), giving the impression that a big win is just around the corner. When in fact, waiting for the bonus can be super stretched. And after playing 1 bonus round follows a long interval (200+ spins) with no bonus game again.
  • During our tests, we often got 4OAK and 5OAK, but only with the lowest-paid symbols. We didn’t see good combinations of high-value symbols, although, in theory, that is surely possible.
  • Gold Factory slot machine is not good at keeping the balance, behaving at the extremes - delivering zero, or 5OAK. Nothing in between. Or making you go through a dead spins streak, or suddenly giving you a few lines with winning symbols. In the meantime, the bankroll is not kept well.
  • The 2 Pick and Click bonuses are delivering instant cash prizes. Naturally, level 3 holds higher amounts than level 1. According to Microgaming, the ultimate reward of the level 2 - Free Spins is 519 000 coins and level 3 - 619 000 coins. But as usual, players' highest expectations are related to the Free Spins excitement. Unfortunately for our test team, we had only mediocre results in the Free Spins - 50x-55x the total bet. A little better luck with the Reactor Bonus - around 100x the bet. But all this couldn’t make up for the loss we endured during the regular spins.
  • All things considered, the prospect of rendering large prizes is onboard; only you need a big bankroll to play long enough to experience all 3 levels of the Bonus game, and most of all to survive until it is triggered. 
  • So, be prepared for A) many dead spins, B) quickly gulping your money if you are unlucky or you play recklessly, and C) often poor Free Spins results, even after a long time waiting.

Hidden parameters and settings of Gold Factory slot (data from the testing team)

  • The frequency of triggering the bonus is statistically, every 209th spin (0,48%).
  • The probability of a hit (any winning) is 38,77%.
  • The distribution of the winnings is 81% in the main game and 19% in the bonus feature.
  • The maximum payout during the tests was 103x.
  • The average winning from the bonus was 54x.
  • Volatility is 6,46 out of 20 (average).
  • The cycle length is average.
  • The rating of the slot machine for the wagering is 5,23 out of 10.
  • RTP of 96.54% allows getting a positive mathematical expectation at the casino.

Multilevel Bonus game

3+ Golden Bonus Coins will initiate the bonus round, occurring in the gold-generating apparatus space. 

  • Level 1 - Pick and Click 4 (out of 12) boiler containers, holding various prizes: 1) cash; 2) Reactor Bonus; 3) Free Spins bonus. In case you only pick cash containers, your bonus journey ends here. 
  • Level 2 - If you pick some cash containers, plus the 1, holding the Free Spins, you will play for the number of your spins by pushing 1 special button. This will determine 2 digit number of Free Spins that will be granted (between 10 and 35), and all the wins in them will have the multiplier x2. 
  • Level 3 - In case you pick some cash containers, the 1 with the Free Spins, and the 1 with the Reactor, then you move in the following sequence: reveal of the cash prizes, playing out the Free Spins, and lastly moving to the higher part of the Gold Factory to Pick and click from additional 12 Reactor containers. You will select containers as long as 2x malfunction containers are picked. That is the end of the bonus. Some consolidation prizes will be granted as well.


  • The manufacturer of this slot machine is a Microgaming company
  • The number of reels is 5
  • The playing lines are 50
  • The cost of one coin is from 0.01 to 0.10
  • The number of coins per line is from 1 to 20
  • The range of coin sizes from 0.01 to 100
  • Maximum winning for a spin is x20,000 (five symbols of the Gold Coin)
  • Maximum winnings in the bonus - 619 000 coins (available only in the prize round)
  • Wild symbol - yes (game logo)
  • Scatter - yes (Gold Coin)
  • Bonus rotations - yes (opens during the bonus game, represented by up to 35 free spins with a multiplier of x2)
  • Bonus game - yes (multi-level prize-winning round of choice of items)
  • The expected percentage of payments in this slot is 96.54%, allowing you to increase your welfare and win a lot of money.

How to win at the Gold Factory slot machine? (Conclusion)

  • We cannot emphasize often enough: Always practice with the slots in the free DEMO version before investing real money.
  • This is one very popular Microgaming slot, but it still is wise to play at big casinos, where the prize pool is filled quicker, so the chance that the slot is in a ‘hot’ mood is real.
  • We give neutral recommendations to the bonus hunters, who attempt to fulfill the wagering requirements.
  • If you decide to deposit real money on the Gold Factory slot machine, it is advisable to have a minimum bet balance of 200/250 bets, enough to stick around until triggering the Boiler Room round. 
  • We do not recommend reducing the number of active pay lines. Spinning on less than 50 lines surely allows playing with smaller bet sizes but ultimately minimizes the chances of good payouts. Better play with steady medium size bets. For example, 20-30 coins per spin. 
  • The optimal bet is customarily 1/200 of your starting capital. Even if you decide to play with another ratio, don’t go all in via the highest stake.
  • The best tactic with Gold Factory is stopping your game session on time. For this slot, the point of exiting seems to be a balance surge with 30-40%. Once you reach this apex, you should quit your game. Also, after a Bonus round, which delivered a large payout, you should pause your session or move to the next slot.

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Written by Kamen Valev
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