In Key Harvest each player attempts to assemble the largest groups of connected field tiles. Players select tiles from the registry and place these into their stores, together with a bid made up of crop counters. If any other player matches that bid, then they may take the field tile for themselves. Players gain crop counters by harvesting the fields they already own and from the succesful bids made by the other players for their store tiles.
Players are assisted by townsfolk and by their own team of farm workers. A number of events will affect all of the players, helping or hindering their attempts to enlarge and consoldiate their land holdings.
At the end of the game points are gained for a player's largest two connected groups of tiles, for the workers they have utilised and for the crops they have kept.
Contents of Key Harvest board game
1 Town Board, 6 Townsfolk Tiles, 14 Event Tiles, 4 Country Boards, 56 Field Tiles, 24 Farmhand Tiles, 60 Wooden Crop Counters, 4 Store Cards, 4 Screens, 4 Turn Option Cards, 1 Cloth Bag, and Games Rules