Bus Upgrades Tech Tree & Milestones
The bus is your squad's moving lifeline. Upgrade its engine to squeeze maximum mileage out of every coal chunk, and fortify its hull with heavy spiked cowcatchers to survive 95,000 meters.
Engine & Powertrain
Directly improves fuel-to-distance conversion ratio and bus top speed.
1.0x baseline fuel burn and travel velocity.
+15% distance per fuel item, faster acceleration.
+30% distance efficiency, reduced engine overheat rate.
+45% distance efficiency, ploughs through small zombie piles without slowing.
+65% maximum efficiency, horn stuns zombies in road path.
Armor Plating & Ramming Cowcatcher
Protects the vehicle hull, windshields, and doors from horde breach attacks.
Fragile glass, zombies shatter windows after 3 hits.
Prevents zombies from leaping through passenger windows.
Instantly kills standard Walkers upon impact; -15% ramming deceleration.
Acid Spitter corrosive vomit deals 60% reduced damage to bus body.
Can smash through Highway Goliath roadblock cars with zero hull damage.
Roof Mounted Auto-Turrets
Autonomous roof weaponry that covers the rear and flanks during scavenging halts.
Mounts 360-degree light machine gun with 500 RPM auto-target fire.
Ignites rear area in continuous napalm stream, roasting pursuing sprinters.
Heavy anti-materiel cannon that staggers Brutes and Bosses.
Auxiliary Utilities & Lighting
Nighttime defense, furnace expansion, and squad convenience upgrades.
Doubles headlight cone distance for earlier obstacle warning.
UV radiation stuns Night Stalkers and removes their shadow invulnerability.
Allows stacking up to 10 fuel items in furnace buffer queue.
Optimal Upgrade Order for 95,000m Extraction
Engine Lv 2 + Window Bars
Prioritize fuel efficiency first to stretch early coal supplies. Barricade side windows to stop fast sprinters from ambushing survivors while refueling.
Spiked Cowcatcher + Roof LMG
Before facing the Highway Goliath at 30,000m, you must have the spiked cowcatcher to ram abandoned roadblock cars and the roof LMG for automated crowd control.
UV Rig + Engine Lv 4-5
The Dead Zone fog spawns lethal Night Stalkers that can only be stunned by UV light. Max out your engine to sprint through the final 10,000m boss gauntlet.
95,000m Environmental Route Checkpoints
Hazard breakdowns, recommended engine levels, and key rewards as you push through each segment of the route.
Suburban Outskirts
Overgrown residential houses, small sheds, abandoned sedans.
Highway 95 Overpass
Multi-lane highway jammed with crashed trucks and roadblock barricades.
Industrial Trainyard Ruins
Rusted warehouses, chemical storage silos, freight train tracks.
The Dead Zone Wasteland
Crumbling highway pillars surrounded by impenetrable toxic night fog.
The Final Stop (Bunker Alpha)
Fortified military gate and blast doors leading to safe subterranean shelter.