The diamond is the wild symbol and it will substitute for all of the other symbols, except for the scatter and bonus symbols, to help and form winning combinations.
There are two scatter symbols, the entrance to the mine and some TNT.
The slot features collapsing reels. Every time that a winning combination lands on the reels, the symbols in it are removed to allow more to fall from above. With a bit of luck this will form another win. At the same time, the slot has a Growing Reels feature. After each collapse, an extra row of symbols is added to the reels to create more ways to win and this way, there can be up to 262,144 ways to win. When no more wins are formed, the slot returns to its original size.
Whenever the TNT symbol lands on the reels, it will remain in place until all wins are paid and a collapse results in no new wins. The TNT symbols then change to wild symbol and all the adjacent regular symbols explode. This also causes the reels to grow and to allow more many symbols to fall into place, potentially forming new wins.
All of the slot’s regular symbols can land in extra-large 2x2 or 3x3 versions. When a big symbol lands on the reels, it crushes and removes all the regular symbols underneath it, which can lead to more payouts.
There is a special walking mystery symbol that can land. When it does, it will stay on the reels until no new wins are formed. It is then activated and will then move around the reels and marks positions it moves over with a mystery symbol. When it stops moving, all of the mystery symbols turn into a random matching regular symbols from the first reel.
Landing three, four, five or six of the mine entrance scatter symbols awards 10, 12, 18 or 25 free spins respectively. During the free spins, the collapsing and growing reels features are still active. However, the reels do not return to their original size until all the spins have been played. Best of all, the free spins can be retriggered.
All payouts in this slot are multiples of the total bet. There is top payout of 75x for landing six miner symbols across the reels. The cart can payout up to 40x, the pickaxe up to 20x and the lantern up to 12x. The white gem can payout up to 12x, the blue and green up to 6x, and all the remaining gems up to 5x.