Terraforming Mars
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Players: 1-5 | Play Time: 90 to 180 minutes | Complexity: Medium-Heavy | Ages: 12+
If there's one game that's earned its place as a modern classic of board gaming, it's Terraforming Mars. Released in 2016 by designer Jacob Fryxelius and FryxGames, this engine-building behemoth has captivated players worldwide with its blend of resource management, card combos, and thematic immersion. It climbed to #3 on BoardGameGeek's all-time rankings, won the prestigious Deutscher Spiele Preis, and has remained one of the most consistently popular strategy games since its release.
But with numerous expansions now available, knowing where to start can be overwhelming. In this guide, we'll cover everything you need to know about the base game and help you decide which expansions are worth adding to your collection.
What Is Terraforming Mars?
In Terraforming Mars, you play as one of several corporations competing to transform the Red Planet into a habitable world. Over multiple generations (rounds), you'll play project cards to raise oxygen levels, increase temperature, and create oceans. These are the three global parameters that must be completed to end the game.
The genius of the design lies in how everything interconnects. Playing a power plant raises your energy production. Energy converts to heat at the end of each round. Heat can be spent to raise the planet's temperature. Meanwhile, steel helps pay for building cards, titanium funds space projects, and plants let you place greenery tiles that boost oxygen. Every resource feeds into something else, creating satisfying chains of cause and effect.
Each player controls a unique corporation with special abilities and starting resources. You'll buy project cards from a shared deck, building a personal tableau that represents your corporate infrastructure, everything from asteroid mining operations to imported livestock to AI research facilities. The player who contributes most to terraforming (and earns the most victory points from cities, greenery, milestones, and awards) wins.
Who Is It For?
Terraforming Mars rewards players who enjoy long-term planning and engine building. If you love watching a strategy come together over time, or get satisfaction from creating synergistic card combinations, this is your game.
A few caveats: games typically run 2 to 3 hours, and learning all the iconography takes a couple of plays. The sweet spot is 3 to 4 players. At two players, optimal strategy often involves delaying terraforming to build your engine, which can make games drag. At five players, expect longer sessions.
The solo mode is excellent if you enjoy puzzle-like challenges. You're racing against a fixed generation limit to complete terraforming, and the huge card deck means every game presents a new problem to solve.
The Expansions: Which Should You Buy?
Prelude — The Essential Expansion
What it adds: 35 Prelude cards, 5 corporations, 7 project cards
If you only buy one expansion, make it Prelude. It addresses the most common criticism of the base game: the slow early turns where everyone is scraping together resources. At the start of each game, you're dealt four Prelude cards and keep two, which jumpstart your corporation with extra production, resources, or immediate effects.
The impact is significant. Games typically run about 20% shorter, and you're making interesting decisions from the very first turn. Most experienced players consider this mandatory. It doesn't add complexity, just removes a weak point.
Hellas & Elysium — Fresh Maps
What it adds: Double-sided game board with two new Mars regions
A simple expansion that delivers exactly what it promises: two new maps with different terrain layouts, milestones, and awards. Hellas shows Mars's southern polar region with a massive crater to fill with ocean, while Elysium features the opposite hemisphere with Olympus Mons (the solar system's largest volcano).
If you're playing regularly, the variety is welcome. The different bonus placements and objectives encourage new strategies without adding any rules overhead.
Venus Next — Another World to Terraform
What it adds: Venus sideboard, new global parameter, new cards and corporations
Venus Next introduces a fourth global parameter: the Venus track. New cards let you build floating cities in the Venusian atmosphere and contribute to making our sister planet more hospitable.
Opinions are mixed on this one. The expansion dilutes the main deck with Venus cards, which can slow down Mars terraforming if players focus on Venus. A "World Government" phase tries to counteract this by automatically advancing a parameter each round. It's a solid expansion, but not essential. Some groups love the extra options, others find it distracting from the main goal.
Colonies — Resource Outposts
What it adds: 11 colony tiles, trade fleet mechanic, new cards and corporations
Colonies expands the game beyond Mars with outposts on various moons and dwarf planets throughout the solar system. You can establish colonies for ongoing bonuses and send trade fleets to collect resources.
This expansion adds more player interaction through competition for trading opportunities. The mechanics integrate smoothly and give you alternative ways to generate resources when your card draws aren't cooperating. It's particularly good for groups who find the base game too multiplayer-solitaire.
The downside: colonies don't contribute to terraforming Mars, so it can feel like a parallel game. Some players find the worker-placement aspect creates more friction than they want.
Turmoil — Political Complexity
What it adds: Terraforming Committee board, political parties, global events, delegates
Turmoil is the most ambitious expansion, adding a full political layer to the game. Different parties rise and fall in influence, global events affect all players each round, and you can send delegates to gain political power.
If you've read Kim Stanley Robinson's Mars trilogy, this expansion brings that political drama to the table. The system is clever. You can see events coming and plan around them, creating meaningful strategic decisions.
However, it significantly increases complexity and play time. This is strictly for groups who know the base game well and want more to chew on. If your games already push three hours, Turmoil isn't for you.
Prelude 2 — More of a Good Thing
What it adds: 25 Prelude cards, 5 corporations, 24 project cards
Released in 2024, Prelude 2 requires the original Prelude expansion. Most cards are designed to work with other expansions (Venus, Colonies, Turmoil), though some work with just the base game.
If you're playing with multiple expansions and want more variety in your starting options, this delivers. It's not essential, but fans who've played hundreds of games will appreciate the fresh content.
Amazonis & Vastitas / Utopia & Cimmeria — Additional Map Boards
What they add: More double-sided map boards
The newest map expansions continue what Hellas & Elysium started. If you've worn out the existing maps and want more variety, these deliver. Amazonis Planitia even features delegate bonuses that integrate with Turmoil.
Our Recommended Expansion Path
Start here: Base game + Prelude
When you want more variety: Add Hellas & Elysium
When you want more interaction: Add Colonies
When you're ready for complexity: Add Turmoil
Optional additions: Venus Next, Prelude 2, additional map packs
Component Quality
Let's address the elephant in the room: out of the box, Terraforming Mars has mediocre components. The player boards are thin cardboard that shift easily, scattering your resource cubes. The cube tokens themselves have a manufacturing quirk with chipped corners.
Many players invest in third-party upgrades like dual-layer player boards (which have recesses to hold cubes in place) or custom resource tokens. It's not strictly necessary, but it dramatically improves the play experience.
The card art is functional rather than beautiful, featuring stock photos and simple illustrations. Some find it charming; others wish for more polish. What the cards lack in visual appeal, they make up for in thematic flavour text and variety.
Final Verdict
Terraforming Mars has earned its reputation as one of the great modern board games. The engine-building is deeply satisfying, the theme shines through in every card, and the strategic depth keeps it engaging after dozens of plays. Yes, it's long. Yes, the components could be better. But when your asteroid mining operation feeds into your heat generation which lets you melt the polar caps... that's gaming magic.
Start with the base game and Prelude. If you find yourself playing regularly, the expansions offer meaningful ways to refresh the experience without reinventing what makes the core game great.
Looking to add Terraforming Mars to your collection? Browse our Terraforming Mars range for the base game and all available expansions.
Quick Reference
| Product | What It Does | Priority |
|---|---|---|
| Base Game | Complete game for 1-5 players | Essential |
| Prelude | Speeds up early game, shortens play time | Highly Recommended |
| Hellas & Elysium | Two new map boards | Recommended |
| Colonies | Resource trading, more interaction | Good Addition |
| Venus Next | Fourth parameter, more cards | Optional |
| Turmoil | Political system, more complexity | For Experts |
| Prelude 2 | More prelude cards (requires Prelude) | For Completionists |