Pirate Armada is a five-reel, ten-line slot from 1X2gaming. Pirate characters and treasure chests provide the maritime theme, with chests serving as the special scatter symbols. Landing at least three of those chests activates the feature described by the studio, which combines chest values with the free-spin result. Its line-based layout differs from Pirate Chests games that use ways or persistent chest meters. The title identifies this particular 1X2gaming edition, so bonus instructions from another pirate-themed slot should not be substituted for its paytable.
To compare related slots formats, read the rules of Blood Rage and Asgard Warriors.
The library also explains the difference between lines, ways and clusters to help put these mechanics in context.
Source: published game information.