69%Strong matchHuman-powered spacecraft
94%69594% positive reviews, Very Positive across 695 reviews·Clicker · Relaxing
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Pilot a lone starship on an endless quest to reach the ultimate speed limit. In this minimalist space incremental, harvest cosmic substances, manage complex thermal and shielding systems, and upgrade your engines to break the speed of light. Every refuel is a new chance to go faster.
Lightspeed
SteamTHE ULTIMATE SPEED LIMIT AWAITS Start from a dead stop in the vast emptiness of space. Your objective is absolute: push your ship's velocity to 299,792,458 m/s and breach the speed of light. Lightspeed is a focused incremental simulation where physics, resource management, and rapid progression collide.
HARVEST, ACCELERATE, REPEAT Take direct manual control of your ship's collection arrays. Hover over drifting cosmic particles and exotic substances to scoop up fuel, watching your HUD tick upward as your velocity, acceleration, and percentage of lightspeed climb.
But momentum is fleeting. When your fuel inevitably runs dry, your velocity zeroes out. The downtime during refueling is your crucial window to access a sprawling upgrade tree, turning every hard stop into your next massive launch.
SYSTEMS MANAGEMENT & FRICTION Going fast isn't just about burning fuel; it's about engineering survival. You must balance multiple tiered systems to maintain your momentum:
DEEP INCREMENTAL PROGRESSION
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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