A treia extensie pentru Kingdom Builder aduce noi provocari pentru jucători. Noile acțiuni suplimentare le vor da și mai multe posibilități pentru a-și făuri regatul după cum doresc. Apare un nou tip de teren: mlaștina, iar cele 6 cărți Kingdom Builder noi fac ca goana dupa aur sa fie mult mai interesantă! Kingdom Builder: Marshlands, the third boxed expansion for Kingdom Builder designed by Donald X. Vaccarino, builds on this already exciting world of skill acquisition and land dominance. There are 24 location tiles with 8 new abilities and 12 summary cards for the edges of the board. There are 4 new board quadrants with the Marshes land type on them. Castles have been replaced with Forts adding a different scoring possibility. To go along with this new land type, 5 Marsh terrain cards are added to the terrain deck. What makes the Marshes expansion unique are the bonus abilities. For the included new abilities, a bonus ability is unlocked if you manage to collect that ability twice. For example, if you have collected the Rider ability, you may move one of your pieces into an adjacent land hex. If you collect a second Rider, then in addition to getting to move twice via your Riders, you can also jump one piece in a straight line to the first empty land hex.