28 Seconds Later challenge in Project Zomboid

28 Seconds Later is one of two new challenges added in the Build 42.20 stable release in July 2026. The other is Top of the World. The Indie Stone's blog describes it in one line: a world full of sprinting zombies. The name nods to the film 28 Days Later, whose infected run at you instead of shambling.

There is a naming mix-up to know about. The official blog and features overview call it "28 Seconds Later". At least one patch-note summary and some wiki pages call it "28 Minutes Later". The name on your Challenge menu is the one that counts. For how challenges fit with other modes, see game modes.

The official notes give no numbers for this challenge. No population multiplier, start date, starting town or loot level has been published, and the guides we checked do not list them either. One summary says the challenge runs on its own world seed (one source). In Build 42 the seed decides things like basements, zombie spread and wilderness borders, so every player would face the same layout.

Whether every zombie sprints, or only a share of them, is also unconfirmed. Players describe the whole map as full of runners, which fits the blog wording. Read the challenge description on the select screen before you start.

You cannot launch a challenge on a dedicated server, since challenges start from the game's own menu. To build something close in Sandbox, set zombie speed to Sprinters in sandbox settings. The sprinters page covers how that option behaves and how to mix sprinters into a normal world.

Most survival habits rely on zombies being slower than you. Here that is not true. Player reports and Build 42 guides point to the same problems:

• You cannot outrun them on open ground. Kiting a crowd around a house, a common Build 41 habit, stops working.
• Noise is far more dangerous. Anything that pulls a group to you, like a gunshot, an alarm or a smashed window, brings it fast. See alarms and stealth.
• Mistakes snowball. One guide warns that sprinters reach you from nearby tiles in quick succession, so a single missed swing can turn into several attackers at once.
• Vehicles matter more. A working car is the only reliable way to beat a sprinter in a race.

Opinion Your first goal is not loot. It is a safe room you can fight from and sleep in.

For barricade options, see barricades. For starting cars, see hotwiring.

Opinion Treat every trip out as a planned raid. Park close, go in quietly, leave before the area wakes up.

• Use guns only with an exit. Shooting is fine when your car is running and pointed away. It is a disaster on foot.
• Clear in small pulls. Make a small noise, step back into a doorway, and let them come one or two at a time. See combat.
• Keep the base small and quiet. A barricaded upper floor or fenced compound beats a big building you cannot watch.
• Keep medical kit ready. You will be hit more often than usual. See first aid.

If you want a challenge where the threat is the weather rather than speed, try winter play or Winter is Coming, or the chaotic opening of A Really CD DA.

Opinion Build for spotting threats early and getting away, not for raw damage. Trait names and costs changed in places for Build 42, so check them on the character screen.

For fuller builds, see character builds and traits and occupations.