Head-to-head comparison
SETI: Search for Extraterrestrial Intelligence vs Terraforming Mars
SETI is the modern, more controlled cousin; Terraforming Mars is the bigger, looser icon. Players who found Mars swingy will like SETI; players who love the card pool will stay with Mars.
Heavy weight
SETI: Search for Extraterrestrial Intelligence
$70
Launch probes, aim telescopes, chase faint signals: a science euro where hunting for aliens actually feels like science.
Buy SETI: Search for Extraterrestrial Intelligence · $70 →
Heavy weight
Terraforming Mars
$70
Engine-building Mars colonization. Hundreds of cards, a million strategies.
Buy Terraforming Mars · $70 →Pick SETI: Search for Extraterrestrial Intelligence if
You want a newer, tighter space game with a rotating solar system, real discovery moments when an alien species turns up mid-game, and a cleaner action economy.
Pick Terraforming Mars if
You want the sprawling classic with hundreds of cards, expansions for years, and five-player support, and you do not mind that some games are decided by the draw.
The tradeoff.
SETI: Search for Extraterrestrial Intelligence
SETI casts you as a research institution hunting for life beyond Earth across five rounds. On your turn you take one main action plus any number of free actions: launch a probe, pay resources to push it through space, then choose whether to land for surface samples or hold orbit for broader coverage. The board is a rotating solar system, so planets literally shift position between rounds and probe timing becomes a real planning problem, launch too late and your target has moved. Back home you point telescopes at distant sectors to scan for signals and exoplanets, analyze the data you have gathered, raise income, upgrade equipment, and play from a deck of more than 200 cards featuring real technology and missions: Voyager, Perseverance, the ISS, the Large Hadron Collider.
Designer Tomas Holek and Czech Games Edition have built that rare heavy euro where the theme does actual work. The rotating solar system is not decoration; it is the central constraint your whole plan bends around, and the slow accumulation of scan data genuinely feels like patient science paying off. If you enjoyed the engine arc of Terraforming Mars or the discovery structure of Beyond the Sun, this sits in that territory with its own probe-and-signal identity. The line also has momentum: the Space Agencies expansion won the 2025 Golden Geek for Best Expansion.
Best for: Strategy Night, Epic Evening, Solo
Terraforming Mars
Terraforming Mars is an engine-building game where you assume the role of a corporation competing to raise Mars's temperature, oxygen levels, and ocean coverage toward habitable conditions. On your turn, you play project cards, use resources, and activate abilities to contribute to the terraforming process while building increasingly powerful economic engines. The elegant core loop, draw cards, spend money to play them, generate resources, creates a satisfying rhythm that rewards careful planning and combo identification. Victory points come from your projects, achievements, and milestones, but the real draw is watching your personal card synergies unfold across dozens of turns.
What distinguishes Terraforming Mars is the sheer combinatorial depth created by its massive card pool and the way different corporations and card draws can lead to genuinely distinct games and strategies. Unlike heavier titles that can feel like solving a deterministic puzzle, this one genuinely rewards different approaches: aggressive early expansion, delayed combo explosions, specialized production chains, even chaos strategies that seem weak until they suddenly ignite. The table energy peaks during these moments of synergy clicking into place, and the semi-competitive nature, you're all terraforming Mars together, creates an inviting atmosphere even when someone pulls ahead. At its best, Terraforming Mars offers that rare quality of feeling both cerebral and joyful.
Best for: Solo, Two Players, 3-4 Players
These are editorial picks; publishers cannot pay to appear here. Amazon links fund the site, and if you'd rather buy local, find a store via BoardGameGeek.
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