Plan B: Terraform Expands With Worlds of Fire and Water DLC

Plan B: Terraform has received its Worlds of Fire and Water downloadable expansion on PC via Steam, giving players two dramatically different new environments to reshape. Released by Gaddy Games on September 23, 2026, the add-on challenges would-be planetary engineers to contend with either relentless volcanic heat or an ocean-covered world whose usable land changes as its climate cools.

The DLC is priced at $4.99, with a 15% introductory discount running for its first seven days. It launched alongside a substantial free update for everyone who owns the base game. The base game is listed at $15.99 and is also included in a 30% Steam Daily Deal at the time of the update's release.

While the paid expansion provides the two new scenario planets, the accompanying update reaches much further than a handful of balance tweaks. It replaces the game's former level-based progression with a new technology tree, adds upgrades and transportation options, broadens extraction possibilities, and introduces climate-focused systems ranging from polar ice caps to greenhouse-gas neutralization infrastructure. Together, the DLC and update give the city-building and terraforming simulation a considerably broader set of logistical problems to solve.

Two planets, two very different survival problems

Worlds of Fire and Water is built around environmental contrast. Terraforming already asks players to manage the long process of turning an inhospitable planet into a place capable of supporting a growing population. The new maps put that core premise under different kinds of pressure, ensuring that familiar industrial routines will not automatically work in every setting.

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Fire World turns heat into the central obstacle

Fire World is defined by extreme temperatures, limited mineral supplies, and ongoing volcanic eruptions. Rather than simply expanding production across an empty landscape, players must account for a world that is actively hostile to their infrastructure and long-term plans. Cooling the planet and making it livable becomes a primary undertaking, while scarce minerals force careful choices around extraction, transport, and development.

That combination should make efficiency especially important. A shortage of accessible materials can make each expansion decision carry more weight, while volcanic activity adds another layer of instability to what might otherwise be a straightforward construction game. The tools and approaches needed on Fire World are intended to reflect those conditions, asking players to adapt their terraforming strategy to a hotter, more volatile planetary system.

Water World makes land a moving target

Water World presents nearly the opposite problem. Most of the surface is covered by water, and construction begins with only small islands available for development. Space is immediately at a premium, making early placement and network design particularly significant.

However, Water World does not stay static. As temperatures decline, polar ice caps expand and sea levels fall. More terrain becomes available over time, opening up new construction opportunities. That evolution also means players need to plan around a changing coastline, cold-weather conditions, and the transition from a primarily maritime economy to one with an expanding supply of land.

The scenario turns climate change into a direct logistical consideration. A site that is separated by water at one point may become connected by newly revealed terrain later, while changing water levels can affect how a settlement's transport and production networks ought to be arranged. Instead of treating the map as a fixed foundation, Water World asks players to build around a planet still in the process of physically changing.

A free update reshapes progression

The biggest system-wide change arriving with the release is a new technology tree. This takes the place of the previous level system, moving progression toward a more explicit research structure. For a game centered on gradual technological and environmental transformation, a tech tree can give players more control over the order in which they pursue tools, industrial improvements, and terraforming capabilities.

The update also introduces several upgrade paths. Some are one-time investments, including upgrades to container capacity and depot flotation. Others can be purchased repeatedly, offering continued improvements to vehicle and drone speed as well as extraction efficiency. These options add more ways to refine existing systems instead of relying solely on placing more buildings or expanding to new areas.

Container capacity is a practical improvement for any large-scale supply chain, potentially allowing a given network to move more material before requiring additional handling. Depot flotation has obvious relevance for an update that substantially expands water-based terrain and construction concerns. Repeatable speed upgrades for vehicles and drones, meanwhile, provide an ongoing answer to the problem of longer routes as settlements spread across a planet.

Extraction efficiency rounds out the upgrade selection by focusing on the input side of the industrial loop. On a world where resources can be rare or difficult to access, gaining more from extractors may be as valuable as expanding the transport fleet. The new progression structure and upgrades together emphasize long-term optimization, not merely expansion.

New ways to travel, extract, and engineer a climate

Transportation receives notable additions in the free update. Small ships are available in the early game, providing a way to begin operating across water before more advanced infrastructure is available. At the other end of the technology curve, late-game airships broaden travel options again. Those additions are especially relevant to Water World, where small islands and shifting sea levels make ordinary overland networks less dependable, but they also increase the possibilities available across the game more generally.

Drones get attention as well. Long-range drone extractors are among the new systems, allowing resource gathering to reach farther afield. This could be particularly useful when deposits lie beyond convenient road or shipping routes, or when placing a full logistics corridor is impractical. Seabed extractors extend resource collection beneath the water itself, fitting the update's expanded oceanic focus and giving players a reason to treat water as more than an obstacle.

Additional extraction systems are also part of the release, though the update's overall goal is clear even without every implementation detail: players now have more options for reaching, moving, and processing the materials needed for a growing settlement and planetary conversion effort.

Climate systems are receiving an equally large expansion. Dynamic polar ice caps and snow bring more visible and mechanical consequences to temperature shifts. On Water World in particular, the growth of ice caps is tied to dropping sea levels and the gradual exposure of new land. The update also adds sea plants and plankton that move with water currents, bringing the oceans more environmental activity rather than leaving them as featureless space between buildable areas.

Water farms join the list of new infrastructure, while rockets offer a more ambitious set of planetary tools. Players can launch shades and mirror satellites, as well as retrieve ice comets. These systems suggest broader options for manipulating a world's conditions from beyond its surface, complementing the ground-based work of factories, extractors, farms, and transportation networks.

Greenhouse gas neutralization plants are another major addition. Their inclusion gives players a dedicated means of responding to atmospheric conditions, a natural fit for a simulation where climate management is inseparable from making a planet habitable. Alongside the new terraforming technologies and systems included in the update, they should make the process of changing a planet more nuanced than a single march toward warmer or greener conditions.

A larger sandbox for planetary logistics

The release is significant because it expands both the variety of locations and the tools used to deal with them. Fire World tests whether players can establish a sustainable industrial footprint under punishing heat, eruptions, and restricted mineral access. Water World tests how well they can work with limited land, shipping, cold conditions, and coastlines that evolve as ice expands.

Meanwhile, the free update makes those scenarios part of a broader overhaul rather than isolated novelty maps. The technology tree, upgrade systems, ships, airships, drone equipment, seabed extraction, dynamic ice, water-based life, agricultural additions, rockets, satellites, comet retrieval, and atmospheric cleanup systems all feed into the larger fantasy of transforming a hostile world through planning and logistics.

Worlds of Fire and Water is available now for Plan B: Terraform on PC through Steam. Players who stick with the base game can still access the free content update, while the DLC provides the new Fire World and Water World challenges for those looking to take their terraforming operations into more extreme territory.