–Warbucks, entering the biome without a Gas Mask.
The Gas Rainforest is a biome introduced in the Don't Starve: Hamlet DLC. This biome is often but not always connected to a Deep Rainforest biome, and can mostly be found at one extremity of the Map. The terrain is a noticeably deeper red color than the Deep Rainforest terrain and has a thin green fog throughout. This Biome can be only found on the first island.
The Gas Rainforest is the only place the player can find naturally occurring Red, Green and Blue Mushrooms (and Mushtrees during a Full Moon). The Ruin containing the Pherostone can be found here, as well as the entrance to the island containing the Aporkalypse Calendar and End Well.
A Gas Mask is required to navigate the Gas Rainforest without taking damage. If the player enters this biome without a Gas Mask, the edges of the screen will produce a green flicker (similar to being poisoned) doing 5 damage per second until the player exits the biome.
The stone turf found near Ruin Entrances and under Relic Fragments or jagged Boulders is not considered to be part of the Gas Rainforest, and thus is safe to stand on. If the stone turf is dug up, however, the ground underneath will revert to Gas Rainforest turf. Since no turf can be placed in the Gas Rainforest, removing the safe stone turf is permanent.
The Gas Rainforest cannot be dug up with a Pitchfork to get its Turf, and doing so will lose all durability of the Pitchfork.
Parrots are the only birds that spawn and land on this biome.
- The Particulate Purifier, available in the Don't Starve: Shipwrecked DLC, can be brought over using the Skyworthy. The item provides the same immunity to the Gas Forest as does the Gas Mask without draining Sanity.