Each Volcano  appearing in the reel releases a Lava Ball, and once the Volcano is full of Lava, it erupts some Lava Balls, which trigger 3 Free Spins.

During the Lock & Win feature, if one or more new Lava Balls appear in the reel, it resets the remaining spins to 3. The Lock & Win feature ends when no more spins are left, or the reels are filled with winning symbols.

If there is a block of icons present during the feature, they'll merge to form a giant block, and their total value will be multiplied according to the format below:

The game will always select the most profitable distribution of giant icons possible.