Green Hell is an intentionally hard open-world survival game. You are abandoned in the Amazonian rain forest with no equipment or food, just your wits. In order to survive, you must utilise real-world survival technics to build your shelter; start fires, set traps; gather food; find clean water; make tools; and craft weapons. In the jungle, you are under constant threat from wild animals and diseases. However, the dangers do not stop within the jungle, the most dangerous enemy in survival is your mind.

The jungle environment dynamically changes and will respond to changes you make to the ecosystems. Unlike other traditional survival games, you must use body inspection mode in combination with foraging for medical supplies to ensure cuts do not become infected or parasites do not start living in your body. Green Hell requires you to manage both physical and psychological strength to find your way out alive.

There's a survival mode where you are relentlessly put to the ultimate survival test in the remote reaches of the Amazon rainforest. The Story Mode invites you to find out what happened to your love, Mia? How can you escape? How can you survive? Seeking answers to these questions will take you to the brink of sanity as you rediscover well-known areas and discover new areas for the first time.