High-stress environments directly impact your character's mental state, making basic tasks significantly harder. The Amazon rainforest is a "living" enemy:

Players must manually rotate their limbs to check for parasites, leeches, or wounds after trekking through the brush.

Tools, weapons, and shelters are built from scratch using harvested wood, stones, and lianas found in the jungle. Psychological Survival One of the game's unique features is the Sanity System :