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Bolt X UP

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Bolt X UP is an online slot developed by Microgaming. It is an electricity-themed game with five reels, three rows, and 243 ways to win. Features include expanding wild...s, multipliers, and free spins. It is a medium variance game with a variable RTP of up to 96.22 per cent.

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  • Maximum win of 10,000x your stake
  • Building multiplier up to 10x
  • Popular 243 ways to win format
  • Medium volatility is a popular choice
  • You can pay to increase the bonus multiplier
  • Variable RTP, so check before you play
  • Lower win potential than previous X UP games


The Bolt X UP online slot, which follows on from the Chronicles of Olympus X Up game, offers a maximum win of up to 10,000x your stake. It is more forgiving than its predecessor, thanks to its medium volatility, and offers a high-voltage visual experience and bonuses including the X UP feature with its increasing multiplier.

Theme, graphics & soundtrack 

This choice of Microgaming slot games has an electricity theme and is set amidst what looks like a mechanically-induced electric storm. Dark blue tones fill the background, along with flashes of electricity, and the reels feature bold symbols that have a traditional theme. The icons include bars and red 7s, which have been given an update to suit a modern game. If you like a slot that looks back in time rather than forward, you may prefer the Secrets of the Phoenix slot.

Bolt X UP RTP and variance

Whichever no deposit mobile casino you choose, it can really pay to try games in free demo mode. This offers the ideal opportunity to test out this game’s medium volatility and find out how its variable RTP of up to 96.22 per cent performs in practice.

How to play Bolt X UP

There is nothing tricky about playing this online slot, but it can often pay to understand the controls before you start. Here is what you need to know:

  1. The three-dot tab opens the paytable and the settings menu. 
  2. Click the coin stack to set your bet per spin. The paytable will update dynamically according to how much you decide to bet.
  3. The three-arrow circle is the autoplay option. Click this and choose how many spins you want the slot to play automatically.
  4. There is a lightning tab on the main screen. Click this to turn fastplay mode on and off.
  5. If you choose to play at a faster speed, be aware of how much quicker your playing balance can disappear. Always remember to play responsibly and make use of features such as timeouts and self-exclusions if you need them.

Bet sizes & paytable wins 

You can bet from 0.10 to 20.00 per spin on this choice of free slot games. There are wins for matching between three and five symbols, with the maximum prizes available for five-of-a-kind combinations as follows:

  • Wild = 90.00
  • Diamond = 80.00
  • 7 = 60.00
  • Bar = 56.00
  • Bell = 50.00
  • Cherries = 40.00

These wins include:

  • 2x to 4x your bet for five-strong combinations of prime symbols
  • 4.5x your bet for five-of-a-kind wild wins
  • The chance to fill the screen with wilds for a 1,093x win
Max-win 10,935x
Volatility Medium
Top RTP 96.2%

Bolt X UP bonus features


This online slot largely revolves around its X Up feature and the scatters that trigger it. This is a major feature of the game, with a token collected in the meter at the side of the reels every time two scatters land on a single spin. This is how you make the bonus round multiplier grow. Collect 23 X UP tokens to fill your meter and benefit from a 10x multiplier. It will also trigger the bonus round.

Bonus round

Another way the bonus can be triggered is by landing three scatter symbols on the second, third and fourth reels during the base game. This will reward you with eight free spins. You can earn two more bonus games by landing a pair of scatters on the second and fourth reels as you play. You can also collect scatters to boost your token meter during the free spins.


This free slot also has an upsizer feature that lets you pay to get a high multiplier. The number of scatters you have already collected will reduce the price you will have to pay for the upsizer feature. You may also have the opportunity to use the buy bonus option, which will get you the free spins and a random multiplier of between 1x and 10x.

Expanding wilds

Expanding wilds can appear on all of the reels, offering the chance to completely fill the grid with wild symbols.

Bolt X UP review: our verdict

This Bolt X UP slot review aims to give an honest opinion of whether you should give this online slot a try. There are so many free slot choices out there that it can be difficult to pick which ones to try, but there is a lot to like about this game. We have come to the conclusion that this game will particularly appeal to fans of X UP games who have been put off by the high volatility of the previous incarnations. This free slot feels far less brutal thanks to its medium volatility; what’s more, our slot review found that it offers a good range of bonus features and a decent maximum win, which should attract all sorts of players.

Disclaimer: Bolt X UP trademark / license is owned by Microgaming. This site is not endorsed by Microgaming.

Slot Data
Slot Name: Bolt X UP
Software: Microgaming
RTP: 96.2%
Volatility: Medium volatility
Paylines: 243
Reels: 5
Min Bet (all lines covered): £0.10 (GBP)
Max Bet: £20 (GBP)
Top Win: 10935
Features: Wild Symbol, Scatter Symbol, Multiplier, Free Spins, Medium volatility, 5 Reels, 243 Ways, Symbol Collection
UK Available in UK? Yes. Microgaming have a UKGC license and are allowed to offer their games at UK licensed casinos.


What is the variance of the Bolt X UP slot?

As mentioned earlier in this slot review, Bolt X UP is a medium variance game. This should offer a better balance between risk and reward compared with its predecessors.

What is the RTP of the Bolt X UP slot?

The RTP of this slot can go up to 96.22 per cent. Be aware that the rate is variable, so you should check this out in more detail before playing this online slot.

Does the Bolt X UP slot have free spins?

Yes, free spins are a bonus in this game. You will start with eight and can win more as you play.

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