Per Magellan's website: "Jackal" is a great strategy game, originating from the 70's MSU (Moscow State University), best-selling and simply the best game of the 2012. You take the command of the adventurous pirates, who disembark on the island searching for the treasure. The goal is to find gold and bring it to your ship. The island consists of tiles, each with different stuff: you can find fort, cannon, meet a crocodile, find a message bottle or dig one of the Captain Jackal's treasures.
"Jackal. Treasure island" consists of basic version and addition. Empty tiles (with meadows) were removed from the basic versions and changed for tiles with new adventures. Rules are uniform, plus there are FAQ included and also a pirate swearing vocabulary. There is a special frame for the island now, put together like puzzle - it helps your map to look more accurate on the table."
Adds some new rules, new tiles, new accessories such as boat, cannonballs, big gold coin. New tiles have different effects, and it is possible to use them instead of no effect tiles from basic jackal, or together to create big island to discover. Much more variants of islands with this extension.