Horizons of Spirit Island is a cooperative game for 1-3 players where each player is a Spirit of nature, defending their Island from invading colonists who have little regard for the well-being of the landor its native inhabitants, the Dahan.

Every turn, all Spirits act simultaneously, employing Powers to push the Invaders back, bolster the Island, and aid the Dahan. The Spirits start out limited and must grow in order to catch up to the rapidly expanding Invaders, whose Actions drive them to spread across the Island and establish settlements, spreading Blight in their path.

To win, the Spirits must drive the Invaders from their island by destroying their buildings and terrifying any survivors.

However, the game ends in defeat if the Island is overrun by Blight, if any Spirit is destroyed completely, or if you fail to drive the Invaders off before they become entrenched.