FREE · NO DOWNLOAD · SURVIVAL SIMULATION

Nuclear War Survival Game: Could You Survive the First 48 Hours?

▶ PLAY FREE NOWNo download · Phone or PC · 3–5 minutes per run · 10 languages

Nuclear Blast: 20 Minutes to Fallout is a free, choice-based nuclear war survival game you play right in your browser. It is 2:17 p.m. on a weekday and you are at your desk on the 18th floor of an office in Seongsu-dong, Seoul. Your phone screams with an air-raid alert. In three minutes a 50-kiloton nuclear weapon detonates 4.8 km away. What you do in the next few minutes, and in the 48 hours after, decides whether you walk out alive.

How the nuclear bomb simulator works

The clock runs on its own and stops only when you have to decide. Every right answer is a real piece of emergency guidance from FEMA, the US CDC and Korea's civil defense manuals, and every wrong answer is a mistake people actually make.

1. Alert (3 minutes): stairs or elevator? Grab water and a radio, or run now? Check the news first, or move?
2. The flash: you have less than two seconds. Look at the light, or drop?
3. The blast wave: it arrives about 14 seconds after the flash. Where you are lying and how you cover yourself decides how badly you are hurt.
4. Golden time: about 20 minutes before fallout starts to fall. Go deep underground, help a coworker, or try to get home?
5. 48 hours in the shelter: water runs low, rumors spread in the group chat, a stranger bangs on the door, the power fails. Random events change every run.
6. Evacuation: when to leave, and which way the wind is blowing.

At the end you see your total radiation dose, your health, which survival rules you followed and which mistakes you made, each with an explanation and the source behind it.

Story mode and random mode

Story mode is the fixed weekday scenario above. Random mode changes the warning time, the wind and the burst height every run, so the safest route is different each time. Each run you also get one random perk that unlocks its own choices:

• 🩺 Company clinic nurseStops your own shockwave bleeding · Properly treats the injured and nausea
• 🔧 Facilities technicianTakes the service route down the stairs fast · Lowers the shutter quickly · Runs the backup generator in a blackout
• 🦺 Safety Team Assistant ManagerHas run the company evacuation drills · takes the blast posture in one go · people listen to you
• 📦 General affairs asst. managerKnows where the emergency bag and radio are · Carries one extra item
• ☕ In-house café baristaStarts with extra water and snacks · Calms people with sweets and warm water
• 🔦 Security guardAlways carries a flashlight · Good at controlling the entrance and keeping order
• 💻 IT developerPhone battery lasts to the end · Sends everyone's texts at once when there's signal
• 📢 PR team stafferWhen rumors spread, writes and circulates an official notice
• 🛋️ Jobless Guy Here for an InterviewDoesn't know the building, slow on stairs · 3 years at a convenience store · Nothing to lose
• 🚴 The lunch delivery riderRuns stairs every day · sprints outside faster · knows the alley shortcuts
• 🧹 The building custodianKnows every storeroom and pantry · the cleaning cart has bags, gloves and masks

10 tips to survive the game (and real life)

1. Move first, check later. An alert is a signal to move, not to verify. The minutes you spend reading the news are minutes you are not going downstairs.
2. Stairs, never the elevator. Elevators stop at every floor during an alert and can trap you when the power goes.
3. Never look at the flash. Close your eyes and drop face down away from the windows. Cover your head and keep your mouth slightly open.
4. Stay down until the blast wave passes. Light arrives instantly, but the blast travels at the speed of sound.
5. Go as deep as you can. The center of a deep basement or a deep subway station blocks far more radiation than anything above ground. An elevated station is not a shelter.
6. Don't drive. Roads jam in minutes and a car blocks almost no radiation.
7. Seal the entrance and stay away from it. Radiation comes in through openings and outer walls.
8. Take off contaminated outer clothing. It removes about 90% of radioactive material. Wash with shampoo, but no conditioner.
9. Trust only official broadcasts. The rumors in the group chat will walk you straight into the fallout.
10. Stay at least 24–48 hours. Fallout radiation drops to about 1/10 after 7 hours and about 1/100 after two days.

Want the real-world version with sources? Read what to do in a nuclear attack.

Send a rescue link to your friends

When the run ends, type your name and share your result. Your friend gets a link with your picture card: “Alex died in a nuclear blast. Will you go to the rescue?” When they open it, they see exactly what you did and which mistakes killed you, and they can try to do better.

FAQ

▶ PLAY: NUCLEAR BLAST, 20 MINUTES TO FALLOUT