84%Excellent matchSpaceflight Simulator
97%6k97% positive reviews, Overwhelmingly Positive across 6k reviews·Sandbox · Space Sim
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A 2D space agency simulator where every object follows the same orbital physics. Land on moons, build colonies, deploy satellites, and reshape entire planetary systems. Deorbit a moon if you want.
9.8
Steam
Imagine the long lost child of KSP and Lunar Lander. With the same amount of chaos, high intensity-high reward, but in a seemingly casual Sunday afternoon relaxed aesthetics. Start with almost nothing. Build the capability to see farther, reach farther, and unlock the next layer of space. Establish observatories, deploy telescopes, and grow your infrastructure to reveal new targets and opportunities and then aim upwards and put your flying skills to the test.
9.8 is a 2D space-agency simulator where a fully physics-driven universe (N-body orbits, atmospheres, heat management, hydrodynamics) makes every small step earned. Build your program from first hops to interplanetary operations through a uniquely designed local star-system cluster.
Every maneuver is flown. Throttle control, trajectory shaping, staging decisions, and precise piloting determine whether you reach orbit or become debris.

Construct vehicles to match the mission. Iterate on design, test under real constraints, and refine until your craft can survive the environment you’re sending it into.

Vehicle construction tools are actively evolving as development continues.
Different environments demand different solutions: vacuum operations, atmospheric flight, surface landings, and ocean interaction with hydrodynamics that behaves like a real medium.

N-body gravity, atmospheres, heat, buoyancy, and momentum all interact. The universe doesn’t “help” you and if you push the system hard enough, extreme outcomes are possible.

Establish stations, colonies, and surface installations to support longer missions, extend operations, and turn distant targets into achievable objectives.

Resources and logistics constraints turn exploration into a real program. Build supply chains, comms satellites, manage tradeoffs, and solve the engineering problems that come with expanding outward.

Playtesting is now open. Join the discord and be a part of 9.8's development.
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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