Sommon Woods is a very large forest with many twists and turns. It also contains poisonous water that will send Mario and Luigi back if they fall on it.
Mario, Luigi, Prince Dreambert, and Starlow all head into Somnom Woods where they met up with Bedsmith who crafted the Ultibed for them. However, Bedsmith says that they must go deeper into Somnom Woods to Pi'illo Temple in order to speak with the Zeekeeper. They done so but it is revealed that they need to find the Pi'illo Masters first in order to proceed into the Temple. Along the way, they come across the "Gentle Children of Somnom", the Nommons, where they worship the Nom Pi'illos. However, some will give up the Nom Pi'illo if Mario and Luigi play a game with them. After finding all of the Pi'illo Masters, the group head into Pi'illo Temple. However, they accidentally activate the ancient Pi'illo Kingdom defense weapon, Pi'illodium, which Mario and Luigi engauge in a battle. After defeating the creature, the group can finally place the Ultibed where Luigi sleeps and Mario enters into Dreamy Somnom Woods.