PopRocks video slot offers the following options:

• Basic pictures,
• Jokers,
• PopWins and Unlock Wilds functions,
• A system of additional multipliers.

Winning combinations are made up of three or more identical icons. They can be located anywhere in different adjacent columns, starting from the first column on the left. Several chains are allowed in one back.
The payout amount in each case depends on the number of elements in the sequence, the value of the symbol and the current bet. Each combination has its own multiplier by which the winnings are calculated.
Any paid chain will activate PopWins. This function increases columns. 

There are five reels in the PopRoks slot machine. Initially, there are fifteen cells for symbols on the screen, but each paid combination stretches the columns in height and adds positions for pictures.
There are no active lines. The bet must be placed on a round. In theory, there are always twenty-five coins at stake, but their value can be less than one cent. In the free demo version on the official Yggdrasil website, from ten cents to ten euros are accepted for a spin.
The RTP of the slot is 96,8%.

Now let's understand the rules of bonus functions:
PopWins - When a winning combination is formed, the customer first receives a payout. Then all the icons from this chain burst. Instead, two new pictures appear. They are selected by a random number generator. They are located in the same column, increasing it vertically. If as a result of this operation a new paid sequence is formed, PopWins continues. Each column can hold up to seven items. The more symbols on the field, the more possible combinations (up to 33 614).
Multiplier - Every seven icons that pop during PopWins increase an additional multiplier by one. It is taken into account when calculating all subsequent payments in this round. At the end of the draw, the odds are reset to zero.
Unlock Wild - This option is activated when all the columns on the field have seven symbols. A joker is guaranteed to appear somewhere on the screen. The additional multiplier is further increased by two points in each case. At each next launch of PopWins, instead of each symbol from the combinations, only one new icon appears.
There is no bonus game on the theme of the slot in PopRocks.

PopRocks mobile slot opens in a browser on any modern smartphones. It doesn't need to be installed as a mobile app. All the nuances of the rules are the same as in the game for computers. The interface of the PopRocks mobile gaming machine is very simple.

There are just not so many slots with the same mechanics. So, you can try these:

• Bounty Pop- The new video slot Bounty Pop from AvatarUX, an Yggdrasil partner, came out 2020 and made overall an excellent impression on the players. This is the fourth slot using the PopWins mechanics. With its Wheel feature, the online slot promises the huge winnings up to 50,000 times of the stake as well as great entertainment.
• Cherry Pop - Avatar UX is back with a third install with their innovative PopWins mechanics. Previous releases haven't really gotten the attention they might have deserved, and that may be due to somewhat obscure and Asian-inspired themes. Judging by the sleek, fruity-inspired look of this release, it looks like CherryPop is an attempt to break into the mainstream.

The plot of the game is quite simple. You will be surrounded in the kingdom of fire. The dark castle is seen through the game.