Events

Completing events on stage 1 to stage 4 will alter the gameplay of stage 5.
It may determine how easy or how difficult it will be to defend the core.
Some events will be done almost automatically, and some events may have other requirements.

Stage 1
- St1 Crane
- St1 Tank
- St1 Generator
- St1 Helicopter
- St1 Escape

Stage 2
- St2 Portal Gun
- St2 Thunder Gun
- St2 Inmunizer
- St2 Mutator Gun
- St2 Zero Grav Gun
- St2 Turret Gun
- St2 Generator
- St2 Truck Escape
- St2 Human Escape

Stage 3
- St3 Generator
- St3 Escape

Stage 4
- St4 Apache
- St4 Plane
- St4 Mech
- St4 Mech Flamethrower
- St4 Mech Rocket Launcher
- St4 Mech Minigun
- St4 Generator
- St4 Ultralisk
- St4 Escape

ZM Items
- ZM Item Summoner
- ZM Item Jumper
- ZM Item Alma
- ZM Item Vortigaunt
- ZM Item Antlion
- ZM Item Shockwave
- ZM Item Predator ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧ ⁨⁣⁧⁨⁣⁧

Items

Most items, including zombie items, are specific to each stage.

Tank: [Mouse1] Shoot [Mouse2] Change camera and cannon angle.
Mech: [Mouse1] Perform attack. [Mouse2] Switch attack.
Juggernaut: [Mouse1] Perform attack. [Mouse2] Switch attack.

NPC: [E] Place a soldier, defends zombies, despawns after 50s.
Inmunizer: [E] Gives people immunity from infection for 20s.
Ammo: [E] Place infinite ammo crate.
Gaus: [E] Fire a beam. 45s cooldown.
Inmunizer Blast: [E] Shoot god mode.
Minigun: [E] Toggle shooting.
Mines: [E] Place a mine. Run over it to pick it up. 13 mines.
Mutator: [E] Drop a mutator pill. Unlimited uses, different mutations. (speed/health/grav)
Portal: [E] Place first portal > [E] Place second portal > [E] Remove both portals.
Thunder: [E] Shoot thunder, 4 uses.
Turret: [E] Place the turret.
Zero Gravity: [E] Remove gravity from nearby zombies.
Hyper Boost: [E] Speed, health, and low gravity for 45 seconds, one use.

ZM Summoner: [Mouse2] Summon a zombie to yourself.
ZM Jumper: [Mouse2] Jump impulse. (while jumping)
ZM Alma: [Mouse2] Kills nearby humans. Enabled when in range.
ZM Vortigaunt: [Mouse2] Attract nearby humans.
ZM Tank: [Mouse2] Hurt humans and fling objects.
ZM Antlion: [Mouse2] Fly for 10s, 20s cooldown.
ZM Shockwave: Push nearby humans.
ZM Freezer: [Mouse2] Create freezing ice nova.
ZM Predator: [Mouse1] Switch attack. [Mouse2] Perform attack.⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

Extremes

Extreme stages are generally harder, but extreme 1 and extreme 3 have the most significant changes, so only those will be covered.

There are multiple ways to get to the end of the stage.

Tank is the very first event you'll be able to do, and it is one of the most important. You press E to at the top of the tank to enter it, right click to aim the camera and cannon, left click to shoot. It one shots zombies. Zombies can knife the tank to kick the human driver out, or humans can shoot the tank to kick the zombie driver out. Aiming down will help you kill zombies right infront of you.

Tunnel gates can be opened for the tank by activating buttons inside the building. They can be pressed again to close the gate.

This is the point where you split up, however, more people should be defending the green route, where the tank will go. Defend further front, so that zombies can't reach humans on the other path. The bridge on the far left will get blown up and a metal rod will be tosssed onto the bridge killing people in the center.

From there, you go to the right, reaching this gate. The people going the other route will get the trigger right behind this gate.

Humans on the red route will reach here, its pretty clear you should not doorhug.

After the gate opens, there are 3 ways to go to reach the crane. The green path has a chance to blow up, but if it doesn't, its obviously the easiest way to go. The blue path may be a little tricky, but its the fastest path. If you reach the top of the tower, make sure the crate does not hit you. Wait until the crane fully stops then climb onto the ladder on the side. Cross it to get to the crate event and rejoin the rest of the team.

One person goes into the building on the left to trigger the bridge. Dumpsters like the one in the picture are where zombies teleport to. At the end, it's common to put NPCs around them.

Again, do not doorhug. The tank can explode the door open for an earlier trigger. The tank can also struggle to get to the top if there's not enough momentum to climb the slope.

You'll reach two events, where you have to complete the tank event by bringing the tank under the magnet, or trigger the generator, usually 1 or 2 people are enough, but it takes a long time and they might die. Activating the generators will activate the elevators, instead of needing to wait 80 seconds. The rest of the team defends the main building in front, and some will defend the building on the left. (the helicopter will pick up the left side first)

Inside the elevator, only 1/4 of the windowpanes are safe. Only leave when you are at the top.

The helicopter will leave the main building and approach the side building, don't be late for it.

The people on the main building rooftop have to defend the elevator entrances until the helicopter comes back. The final helicopter provides infinite ammo.

The initial path of stage 1 is blocked off, and the mountain to the right side will blow up. Climb up the mountain until you reach the road and take a left.

One person needs to run up the tower and pull the trigger to open the main gate. Another person can run into the building and run down the wire to get to the tank.

At the split, follow the sign and take a right and enter the facility. Only the tank goes left towards the bridge. If any humans go onto the bridge, it will break, and if any human is ahead of the tank, the tank will not be able to reach the end.

Crane

How: When crossing over the crane, a player must fall onto the red crate and press E on the connector connecting the crate to the rope.
Requirements: Tank event (stated below) must also be completed.
Reward: Juggernaut will spawn on 2nd half of stage 5.

Tank

How: Drive the tank at the beginning of stage 1 to the end of the stage 1, under the helicopter with the magnet.
Reward: Reinforcements east side, 4 soldiers and 1 tank.
Unlock survival ending on stage 4 and stage 5.
Fulfil requirements for crane crate juggernaut event.

Generator

How: Near the end of stage 1, one player goes down the tower to the right and activates the generator, it is random between 3 generators, left, middle, and right. The player will probably die.
Reward: Earlier elevator trigger and one generator on stage 5, speeding up charging process.

Helicopter

How: Win stage 1, have at least 1 human on the helicopter.
Reward: Helicopter will appear on 2nd half of stage 5, players can climb in it to cover one of 4 sides. It will provide infinite ammo.

At the very start, on the bridge, cars randomly spawn and get flinged around. Zombie tank can also flip cars. First two buttons are on the right, one outside, one inside.

Lobby

This is the main lobby, you'll constantly return to this room. The power room is always the 1st room. The 2nd room is either the weapons room or minification room. The 3rd room is always factory. Also note that the blue pillar in the center can push/freeze zombies.

Power Room (1)

For the 1st room, everyone should defend the lobby and only 1 person should go up to trigger, then everyone progresses to the 2nd room, there is a zombie teleport.

Minification Room (2)

Either the minification room or the weapons room will open up, its random. To get to the end, 1 person has to go through the teleporter on either side to complete the minigame.

The rest of the team should defend the main path while the player navigates the minigame. There is also an item spawn here, the mutator.

Once the player makes it through, he can open the door from the other side for the team.

Shoot the vents to escape.

Jump out of the windows towards the right side and make your way back inside the building.

You're back at the lobby, be sure to press the button on the ground.

Weapons Room (2)

You will only go through either the weapons room or minification room, but not both. Each section has a weapon each, far left having zero gravity gun, left having turret, right having gaus, and far right having thunder gun. You can defend the main doorway instead of 4 separate areas.

After getting out, turn around and shoot the vents.

Climb over the boxes to cross the large pipe.

Remember to press the button.

You're back at the lobby, be sure to press the button on the side, move as a group and shoot the pillar to push zombies out.

Factory

Most of the team should climb up the boxes, then defend at the boxes for a long time for the shortcut, this is the green route. The red route and blue route are similar, red route follows the catwalk above, and the blue route follows the conveyors. The people going ahead should trigger the shortcut.

This is the one of the shortcuts, the left yellow box is closer to the defenders, the right yellow box is further, most of the time you'd just need to trigger the one on the left. Press the button to open it, and press it again to close the shortcut doors, its good to close them.

You can also get to this button, pressing it will make the crates start moving, which you can ride to the end.

Press the button on the left side of the bridge to lower the bridge, zombies can press it too. In the top left catwalk, there is a portal gun, its pretty broken.

On the other side, the button on the right side of the bridge can be pressed to raise the bridge back up. Press E on the side button to open the large doors, then shoot the vent and drop down. You should only go to the generator if you know what you are doing.

While a few people go to the generator, this is where the majority of people should defend, they are able to rejoin the team through the doorway on the left, after the people who went to the generator get teleported.

The path up the generator is pretty tricky, You do not need to be extremely fast, so be careful.

Find the doorway in the revolving walls to get to the generator in the center.

Activate the generator then get in the teleporter. A trick to get out even faster is to press the button next to the teleporter exit to run the conveyor in the opposite direction, then run with it.

Escape

Exit through the vent on the right.

You'll end up back in the lobby, then make it outside the facility through the way you came in.

Press the button on the escape truck. Do not stay too far back on the truck or you might die to the explosions. Escaping with weapons are an event!

Weapon Items

How: On stage 2, you can pick up weapons from the weapons room, the mutator from the minification room, and the portal gun from the factory. When escaping the factory, you must have these items with you in the truck. For all 6 items, you need 6 people to survive with 6 items. (On normal, 1 room does not open, impossible to get all 6)
Reward: Items will be available to use on stage 5.

Generator

How: One person has to navigate the factory and get the trigger for the generator. The path up to the generator is rather tricky. You may not have time to rejoin the team.
Reward: Another generator on stage 5, speeding up charging process.

Escape

How: Escape from the facility on the escape truck. Zombies may camp players trying to escape. If you manage to make it out, stay near the front of the truck to prevent dying from explosions behind. Otherwise, it will be a "truck escape" instead of a normal human escape.
Reward: Reinforcements south side, 3 soldiers and a small truck with items saved.
Larger truck will block one path completely on 2nd half of stage 5.

Start by breaking your way out of the glass rooms, then walk until the end and take a right.

Hit the button above the doorway, either by climbing up the sides, or walking around, infront of the wind blowers.

The first door needs 1 button, the second door needs 2 buttons, the third door needs 4 buttons.

The majority of the team should defend here, while 1 person goes back to get the trigger.

The person who goes back has to cross the tubes.

On the other side, the first person has to go up either elevator on either side and to trigger the button above. Hitting the trigger will remove the tubes, and everyone goes to the center elevator.

At this part, there are 2 triggers on either side, which will raise the middle bridge.
You can also strafe around to get inside the center.

Trigger the generator to open the door ahead, and pick up the hyper boost item, its very important.

Take the ramp on the left.

One zombie will be chosen at random to become the boss. Zombies cannot knife you here, and can only run around, however the boss can damage you with its attacks.

After killing the boss, get on the truck and ride out of the facility, zombies might try to get on too.
A possible strategy is to use hyper boost after the boss dies, or when the final gate opens, and you use the speed to run out of the facility.

Shoot the barrels to close the door, sealing zombies inside. If the win isn't triggered, try running to the truck.

After breaking out of the glass rooms, proceed to the green vent, instead of the door.

This is the first room you enter, go through the door on the right and defend that door, press the button on the door to close the door, then press the button on the machine to set the room on fire.

When the fire test activates, humans can leave through the vent in the small room.

Do the same thing for the gravity test, enter the small room, close the door, activate the machine.

When the test activates, the glass breaks and you can go to the next test room while zombies are being pulled.

Next is the ice test, however it isn't really needed to enter the small room apart from the trigger. Run into the next room when zombies are frozen, just be sure to stay away from any frozen zombies.

Do the same thing for the ultima test, close the door, activate the machine, and when the ultima is set off, you can leave the room and head to the left.

One player should pick up the hyper boost in the center of the ultima test room.

This is the hardest part of the level, you have to defend the bottom left, bottom right, and the top path for 20s until the door opens. All paths lead to two elevators, which leave as soon as someone triggers them. You'll then reach the generator of stage 3.

Generator

How: Escape on the truck.
Reward: Infinite ammo crate on stage 5, single use but lasts forever, and zombie immunity bomb.

Escape

How: You'll come across the generator eventually, it is needed to open the next door.
Reward: One more generator on stage 5, speeding up charging process.

Start by getting on the back of the truck, its a ladder. The truck moves to the gate and you can climb on the wall. You have to defend for quite a long time until reinforcements come in.

While defending, you can do the apache helicopter event, and someone should manage the tank in the hangar on the right.

Anti-air guns can be used to help the defense. Press E on the left side nozzle of the anti-air gun to toggle it's aim trajectory, between aiming up to hit close targets, or aiming straight to hit far. the button on the right will fire the gun.

The plane will drop items, that's another reason to defend well for.

A train will come crashing through the center, you'd want to stay out of its way. Its possible to get on the train.

When the train crashes on the other side of the gate, it'll leave behind an injured train driver, which you'll have to bring to the train to complete the event.

You can run through the buildings on the left, but it doesn't make much of a time difference. This part is just a normal defense while waiting for the gates to open. The final gate can be opened by 1 of two ways. One is by using the airfield gun on the roof to blow the gate up, the other is by following the sign and pressing the button.

Bringing the train driver to the front of the train will make it start moving. You should wait for your team to get to the train, there is no point to take the airplane. It is around here where the tank should be abandoned. Remember, zombies can pick it up again.

Trigger detonator to set off the explosive, you should not doorhug.

Once inside the building, you can either go left, or go to the door on the right.

Going left will bring you to the left half of the corridor, where the mech is.

Going right will take you to the generators.

This is where the team rejoins, and these two metal doors are to be broken open.

Trigger the detonator and defend until the bridge blows up, so zombies can't enter the hangar.

When the door opens, you should run as fast as you can, away from the ultralisk.
You can consider teleporting the mech from this point on.

Wait for your team before closing these doors, it will hold the zombies back for quite some time.

Do not stay in the middle, the tanks can kill you.

This is the final hold. For a normal win, everyone will die. The first button will raise up the nuke, and the second button will make the nuke defense rise up. For a normal win, you simply survive until the nuke goes off.

For a survival win, after completing the tank event on stage 1, a helicopter will land on the helipad for a short time, and people can get on it.

Apache

How: Bring fuel to the apache helicopter, random fuel spawns.
Reward: Anti-air guns at the final hold of stage 4.
Apache helicopter circles around the second half of stage 5, killing zombies.

Plane

How: Bring the train driver to the front of the train. The train will leave, allowing players to ride on it. The plane will not crash. Wait for your team if you have the train driver.
Reward: Two tanks at the final hold of stage 4.
Reinforcement drops at second half of stage 5: minigun, plasma gun, mines.

Mech

How: One player gets into the mech, and another player upgrades the mech. Mech needs to go on teleporters and the other player activates the buttons to upgrade it. It will unlock the flamethrower, rocket launcher, and minigun. Hold down W+S to teleport the mech to stage 5.
Reward: Mech appears on stage 5 with the upgrades given.

Generator

How: Before the hangar, there are 3 generators, spam E on each generator until the bars are fully raised.
Reward: Another generator on stage 5, speeding up charging process.

Ultralisk

How: Kill the ultralisk at the end of stage 4, activating the nuke is the easiest way.
Reward: Ultralisk will not appear on the 1st half of stage 5. The appearance of the ultralisk will break down the walls and make it harder to defend against zombies when dealing with the last 2 bridges.

Escape

How: A helicopter will appear at the end of stage 4, which you can get on and fly away, avoiding the nuke, it leaves pretty fast.
Requirements: Tank event must also be completed.

For the 1st half of stage 5, you have to defend the main gate. Zombies only have 1000hp, despite the 1:1 ratio. Gates can be closed, but the next gate can only be closed after the previous one was broken.

Blue streaks around the edges provide speed.

Every once in a while, red markers will appear above doors. These indicate that reinforcements have arrived at the door.

Press the button at the side to open the door to let reinforcement trucks enter and for you to bring soldiers in.

When a reinforcement door opens, a portal opens for zombies at the main gate. It teleports them to the reinforcement door. A while after opening the reinforcement doors, you should close them. You don't need to be defending more than 1 side.

In the center of the arena, bridges will slowly lower by themselves. When all 4 have lowered, (6:00) you need to get back into the center and it will rise to the top when the button is pressed.

For the 2nd half of stage 5, you have to defend 4 sides. However, zombies are easy to kill, one side is closed off by a giant truck, another side will have an infinite ammo helicopter, and there are tools that can help you defend. The core center has infinite ammo. Do not think about running up any ramps.

Shooting the giant red circle will cause zombies to slow down and fly up.

Shooting the green circles (center of the vent) can cause zombies to be pulled in.

One person has to manually open the blue part, then it can be shot, causing an explosion.

As time passes, gates on the sides reveal pathways up to the generators. Generators speed up the charging process of the core. Only 1 person needs to get the generator, you should get at least 2 generators. If you won all stages, you are guaranteed to get 2 generators from stage 2 and stage 3. If it charges too slowly, the 9 minute global nuke kills everyone.

At this point where the core is fully charged, there are 3 possible endings.

1. If the tank event was not completed, everyone has to defend until the end until the final nuke occurs and kills everything.

2. If the tank event was completed, a helicopter will appear and you can run up one of the ramps to escape in it. The helicopter comes from one direction and makes a left turn, so make sure you are going up the right ramp.

3. Last man standing, the true end. If zombies hit the core 3 times, and generators are activated for a faster charge, a nuke is set off, and kills all humans but 1. They have to get to the top in the center, where they pick either the red button or the blue button. Red being an easy nuke, and blue being the true ending, where you drop down and run for the core while zombies chase you. Also, you have to jump at the end of the ramp. You should see the ending for yourself to learn it.