The Pirates Chest feature is triggered when a Pirates Chest symbols are set on a pay line is created. The Pirates Chest symbols used in the pay are opened to reveal either normal booty or, if a 2X appears, then all the Pirates Chest wins are doubled.
The Free Spin Plunder is triggered when the Plunder symbol appears on the 5th reel with 2 or more Pirate Portrait symbols on reels 1,2,3 or 4. Pete the Pirate will swing onto the screen and with showers of deblunes, will clear the symbols on the screen, as well as reveal the Bonus Dash. He will explain the bonus and how to play the Free Spin Plunder Bonus and the Wild Symbol, and then prompt the player to start the bonus by pressing the button on the screen or any of the Line or Bet buttons on the dash. During the free spins, the Pirate Portrait symbol becomes wild and yer booty increases!