Following the disappointing slog that was Assassin's Creed III, Ubisoft's Black Flag was a fresh breath of sea air for the increasingly stale franchise. Playing as the Welsh privateer-turned-pirate-turned-assassin Edward Kenway, you are given your own ship and crew to explore the vast open world that Ubisoft sets before you.
There are plenty of opportunities to earn that sweet booty, from hunting whales to sell their skins to the usual assassin contracts, there's plenty do throughout Assassin's Creed IV. On top of that, there are also 4 'Legendary Ships' to fight that require your ship be heavily upgraded before you tackle them, but succeeding feels really rewarding and it doesn't hurt that it pays well.
Sailing between all these locations can feel tedious at times, but the collectable sea shanties solve that problem (at least it did for me); I'd happily forego fast-travelling to my destination so I could join in singing with my merry crew.