Fortune Island signals a shift for Forza Horizon expansions. The add-ons for the previous game, Blizzard Mountain and Hot Wheels, created variation by fundamentally changing the experience of driving. The former put every car on ice and snow, and the latter confined them to relatively-thin orange tracks. They found novelty in mild subversion, just changing enough about Forza Horizon to warrant their own content packs.
The first expansion for Forza Horizon 4, Fortune Island, doesn’t rely on similar methods. It whisks us away to a remote island that’s said to hide untold riches. In doing so, it turns a treasure hunt into a central mechanic. Impressively, it manages to be far more interesting than all the Hot Wheels loop-de-loops in the world.
Source: Destructoid Review: Forza Horizon 4: Fortune Island