Playing is very simple. Because the paylines are already predetermined, all you have to do is determine your bet and press the play button. To win you need to land at least 3 identical symbols on one of the paylines. Counting starts at the far-left reel and goes from left to right.
After you have loaded the slot machine you can play immediately. Rock Vegas starts with a standard bet of €2, if you want to adjust this, you can easily do this using the buttons below the playing field. Here you can also see what your balance is.
To make it easy for you, you can enable the autoplay. This ensures that the slot machine automatically plays a number of selected rounds. Here you can choose to skip animations so that it all goes a little faster. Pay close attention to your balance because the function only stops after the number of rounds has been met or when you indicate that it may stop.
Rock Vegas has a total of 11 different symbols. The man with the beard is the highest value symbol and in the style of Pragmatic Play you only need 2 of these to trigger a win. Furthermore, there are 9 other symbols that give a prize and there is 1 special symbol. This plays an important role in triggering one of the features.

Despite the fact that Rock Vegas has 'only' 1 special symbol, the slot machine contains several features that can boost your winnings considerably. 

The main feature of the slot, as you can read fr om the title, is the Mega Hold & Spin. You trigger this by landing the special symbol, the Scatter in this case, on your playing field. You need at least 3 of these.
A new 10×10 playing field will appear wh ere you will earn 3 respins. During these spins, only stone symbols, keys or blank spaces land on the playing field. If a stone or key lands, the respin counter resets to 3.
The stones have different colours, and each colour represents a multiplier value. Blue means x0.1, green means x0.2, yellow means x0.4, pink means x0.6 and orange means x1. The number of Scatters that landed to trigger the feature determines how many and which stones appear in your field.
3 Scatters: Any colour can appear on any reel
4 Scatters: Only green, yellow, pink, and orange land on the reels
5 Scatters: Only yellow, pink, and orange stones land on the reels
If you make a cluster with the same symbol the size of 2×2 or 3×3, you will earn a random multiplier. With the 2×2 it varies between x5 and x10, with the 3×3 this is x35 to x500.
Key Collection
You can also collect keys during the Mega Hold & Spin. Progress is tracked in a special meter. Each key opens a chest and can contain one of the following rewards:
Instant prize from x10 to x500 your bet
Any number of keys you collect. You get between 4 and 10 keys
a retrigger
A multiplier that multiplies the multiplier of a tile by x0.5 to x500
A general multiplier that is applied after completing the feature. Its value is between x2 and x100. If you collect more than 1, the value of these multipliers is multiplied together

The number of keys you collect is therefore kept in a special meter. When this is completely filled you reach the Mystery Multiplier. The value of this multiplier varies between x2 and x100 and is applied after the Hold & Win feature has come to an end.