687 Days on Mars is a survival game where you are stranded alone on Mars - your task is to manage resources, build a base from scratch, grow food, and explore the red planet in search of supplies and other hidden challenges. Every breath and decision counts - can you survive on the Red Planet?

<img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/8c18f078ab69dcf78410258c34e343d4.avif?t=1762942854" width=600 height=174 /> <img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/6edbf1a0ea8aef1111328822845e7f61.avif?t=1762942854" width=600 height=80 /> Alone on Mars, you awaken with nothing but your suit and a handful of supplies. Every breath, every drop of water, and every spark of energy must be carefully managed as you fight to survive on a planet that wants you gone - you navigate the harsh realities of life on the Red Planet. <video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/c6bcaddd9c476cd30944a77f237f4bfc.poster.avif?t=1762942854" width=616 height=324 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/c6bcaddd9c476cd30944a77f237f4bfc.webm?t=1762942854" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/c6bcaddd9c476cd30944a77f237f4bfc.mp4?t=1762942854" type="video/mp4"></video> <img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/b53db1de360c254d0b6adf353766e6b9.avif?t=1762942854" width=600 height=80 /> Start small and dream big. Expand your outpost with life-support systems, storage units, and advanced research modules. Every upgrade increases your odds of long-term survival, letting you transform a fragile shelter into a thriving Martian base. <video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/b3169fc95738abc4099df4b84c4f7f15.poster.avif?t=1762942854" width=616 height=324 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/b3169fc95738abc4099df4b84c4f7f15.webm?t=1762942854" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/b3169fc95738abc4099df4b84c4f7f15.mp4?t=1762942854" type="video/mp4"></video> <img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/522fad500c3bf5b556c351453d9699e2.avif?t=1762942854" width=600 height=80 /> Unlock the secrets of Mars through dedicated research. Develop new technologies to improve your equipment, optimize resource management, and adapt to the planet’s unique challenges. Every breakthrough brings you one step closer to surviving in this environment. <video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/01e0aa85af456674760d84096f8b46b2.poster.avif?t=1762942854" width=616 height=324 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/01e0aa85af456674760d84096f8b46b2.webm?t=1762942854" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/01e0aa85af456674760d84096f8b46b2.mp4?t=1762942854" type="video/mp4"></video> <img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/45a5ea90a409ef233daec5d2cc338092.avif?t=1762942854" width=600 height=80 /> Construct makeshift greenhouses to grow your own food and produce vital oxygen. Using advanced aeroponic and hydroponic methods, you can cultivate plants without soil, overcoming the challenges of Mars. Experiment with different techniques to survive and adapt to the environment. <video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/051b00301728277a306135ac4c434fa7.poster.avif?t=1762942854" width=616 height=324 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/051b00301728277a306135ac4c434fa7.webm?t=1762942854" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/051b00301728277a306135ac4c434fa7.mp4?t=1762942854" type="video/mp4"></video> <img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/01433565468542078cecbaa2656b9ba2.avif?t=1762942854" width=600 height=80 /> Leave the safety of your base to explore the vast Martian landscape. Search for previously sent supply drops and unexpected discoveries that could change your fate. Every expedition brings new risks and rewards. <video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/42ac0497ee6d5451933fd9e95bc51e8b.poster.avif?t=1762942854" width=616 height=324 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/42ac0497ee6d5451933fd9e95bc51e8b.webm?t=1762942854" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/42ac0497ee6d5451933fd9e95bc51e8b.mp4?t=1762942854" type="video/mp4"></video> <img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3850980/extras/41bb719cb912007394b1213bf4f494c2.avif?t=1762942854" width=600 height=60 />

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687 Days on Mars Achievements