Opis w języku angielskim:
Keyside is played over three years. Each year is divided into two phases: landing and resolving harbors.
In the landing phase, the lead player uses a die to move a boat into a harbor, then places a boatman, the die, and a worker into that harbor. Other players can join in.
In the resolving harbor phase, the lead player chooses a harbor to resolve that contains one of their workers. All players with workers in that harbor will gain a benefit such as gaining resources, animals, building a headland, access to farms, markets and skill tiles, worker movement and recruitment.
Players score points based on the harbor-scoring criteria multiplied by the number of their workers in the harbor. In addition, points are scored for headlands, skill tiles, and buildings in the player's village. The player with the most points wins.