Obsidian has announced the Rot and Ruin Update for Grounded 2, the $29.99 Game Preview survival sequel available on Xbox Series X|S, Xbox on PC, Game Pass, Steam Early Access, and PlayStation 5. The fall update adds a new Woodpile adventure area, a Centipede boss, the Potato Beetle Buggy mount, base painting through a paintball gun called the Splotcher, and a higher gear tier system built around a new Bismuth resource and the Yoking Press. Obsidian has not given an exact release date beyond “this fall.”
Grounded 2 shrinks players to the size of an ant in a sprawling backyard world where they craft weapons, forge armor, and build bases alone or in co-op, riding tamed insect Buggies. A persistent threat stalks players as they dig deeper, closing in the more they uncover. The sequel is still in Xbox Game Preview. Rot and Ruin is a major iteration inside that early access build, which will not reach version 1.0 until 2027. Every system it touches is still subject to change before the full release.
The Woodpile, the Centipede, and a connected gear loop
Grounded 2 shipped with crafting and survival, yet its highest gear tiers had no specific set of challenges that demanded them. Rot and Ruin adds a new high-threat zone and a new tier system at the same time. The Woodpile brings back termites, including Workers, Soldiers, the Termite King, and new O.G.R.R. variants. Obsidian says the termites have new attacks and “particularly strange behavior” as players push deeper in. Obsidian also puts the Centipede in the Woodpile, calling it a formidable new boss and one of the community’s most requested creatures.
Weapons and armor can now be upgraded using Bismuth, a resource tied to the strange forces of Raw Science beneath the Park. Players gather Bismuth, refine it, and use the new Yoking Press to push equipment past the previous tier ceiling. Fighting the Woodpile’s termites yields Bismuth, which funds the next tier, and each tier makes the Woodpile more survivable.
The Centipede gives the Rot and Ruin loop a defined endpoint. A boss scaled to the new tier ceiling sits at the top of the Woodpile, and the termite variants fill the difficulty gap between standard enemies and that fight. Players can test incremental Bismuth upgrades on the termites before committing to the Centipede.
What a $29.99 Game Preview update means across five platforms
Rot and Ruin applies to the full Game Preview footprint: Xbox Series X|S, Xbox on PC, Game Pass, Steam Early Access, and PlayStation 5. Every platform owner who bought in for $29.99 gets the update in the same window, whether they play through Game Pass, Steam, or the PlayStation 5 version. The original Grounded was offered on PlayStation Plus in June 2026, and the sequel is available across the same breadth of platforms in early access.
The cost picture splits by storefront. Game Pass subscribers receive the update through their subscription, while Steam Early Access and PlayStation 5 players get it through the $29.99 Game Preview purchase. Obsidian frames Rot and Ruin as an update to the existing build.
The announcement does not mention any platform-specific delay. All five storefronts receive the update in the same fall window. How the update interacts with cross-platform play or shared worlds remains unstated.
Painting, the Splotcher, and the Potato Beetle Buggy in practice
Players could already place walls, floors, roofs, stairs, and doors, but color differentiation was not available. Builders can now craft paint and apply it using the Splotcher, a new paintball gun. A base can have color-coded rooms, visible team zones for co-op groups, or a personalized look that does not require modding. The Splotcher applies paint to structural pieces individually, so players can create patterns without replacing the structure itself.
The Potato Beetle Buggy is larger than the Ladybug Buggy and built for close-range combat. Its spread of projectiles hits creatures directly in front of it, and its Healing Roar helps keep riders alive during fights. The Ladybug Buggy remains the smaller mount, so the Potato Beetle Buggy adds combat and logistics options on top of it. The buggy hauls resources and contributes materials to blueprints while the player is out building. A player can park the Potato Beetle Buggy near a construction site, place pieces, and have its stored materials count toward the blueprint without running back to a storage chest. In a co-op group, a driver can fight and heal from the saddle while teammates gather and build.
Confirmed versus unannounced details
Obsidian confirmed the broad feature set but left several specific numbers out of the announcement. The Bismuth tier ceiling, the Centipede’s attacks, health, and phases, the number of new SCA.B Themes and figurines, and the buggy’s haul capacity, Healing Roar cooldown, and projectile count are all undefined. Players will also have to wait for details on how much paint a single crafted batch covers and whether the Splotcher has a finite ammo count. What players can plan around now is the fall window, the five storefronts, and the feature list; everything else is pending patch notes.
The update also adds new stations and other content beyond the Woodpile, Centipede, Potato Beetle Buggy, painting, and Bismuth systems. Obsidian left those stations unnamed. The announcement says “new SCA.B Themes, collectible miniatures, new stations, and more,” but the exact scope of that “more” is undefined.
Grounded 2 sits inside a broader Obsidian slate that includes a new Fallout game at Obsidian, but Rot and Ruin is a separate product line with its own development cadence. The announcement does not connect the update to that Fallout project.
