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They Are Billions in 80 Days

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Day 1

  • See if your starting position has a 10+ tree deposit; if not, restart the card.
  • Send your archers in all directions. Scout the entire area until you encounter zombies (don't attack them) and collect all the resources you can find.
  • Look around and make a plan that will help you create effective lines of defense between trees, mountains, and water.

    2-5 Day

  • Build fishing and hunting huts.
  • Build residential buildings until your food count drops to zero.
  • Build a sawmill.
  • Build a quarry.
  • Build a mill before your energy reaches zero.
  • Build a soldier's center.

    5-10 Day

  • Your gold income is between 200 and 400.
  • Keep building residential buildings until your food reaches zero.
  • When you have enough resources, build a wooden store.
  • Explore the farm.
  • When you have the resources, research the market.
  • If you don't feel safe, research ballista.
  • Constantly create more archers.
  • Build more fishing and hunting huts.
  • Create farms wherever you have 50+ food items or 40+ (if you really need it).
  • Block all entrances and unprotected areas with walls.

    Day 10

  • Get ready for the first wave.
  • You can stop this wave with archers. If you feel in danger, build a double wall.
  • If you have time to research the ballista, build it.

    10-18 Day

  • Your gold income is 300-500.
  • Build your market in the middle of your homes (I'll teach you how to properly place your residential area at the end of this guide).
  • Explore wooden residential buildings.
  • Continue the construction of quarries, mills, sawmills and food buildings.
  • Continue building housing and start upgrading it.
  • If you have the resources, research the stone workshop.
  • Keep building archers.
  • Build a ballista at each entrance.
  • See what you were looking for during the first day and see in which direction you want to expand.
  • Take all your archers and start killing all zombies in that direction, then start building Tesla towers behind you.
  • When you reach a new narrow passage, you can stop expanding.
  • When your archers are idle, send them to expand the territory. At this point, never stop planning new extensions.
  • When you have enough resources, research the sniper.
  • Stop building archers and start building snipers.

    Day 18

  • Get ready for the second wave.
  • At this point, you should have enough archers (about 10-20) to fight off a wave without towers.
  • You must have a ballista at each entrance that can hold the wave alone (if there is a double wall).

    18-26 Day

  • Your gold income is 500-1000.
  • Build a stone workshop (if you haven't done so before).
  • Explore the bank.
  • Place the bank near the market.
  • Place a warehouse (look where you build it as it increases production). At the end of the game, you need at least two warehouses.
  • Since you now have sufficient income, start expanding like crazy. Place sawmills for every 10+ trees and quarries for every 3+.
  • Explore stone houses.
  • Explore the stone walls.
  • If you don't have enough room for mills, research the power plant.
  • Build more farms and houses.
  • Build more mills.
  • Make upgrades.
  • Create more snipers and send them with your archers to kill the special zombies you are now likely to meet.
  • If you have the resources, research the foundry.

    Day 26

  • Get ready for the third wave.
  • You now have archers and snipers.
  • You should have a stone wall in the attacked position.

    26-34 Day

  • Your gold income is 800-1500.
  • Keep expanding.
  • Keep doing upgrades.
  • Keep getting more gold.
  • Keep building more troops.
  • Start looking for a new location for a second city.
  • Start building the second city only if the first city is 100% provided, and you can use excess resources. This will significantly slow down your progress, but it will also increase your gold income.
  • Consider having 2 ballistae on each wall.
  • Harpies can jump onto your wall and wipe you out completely before you even know what happened.
  • When to stop building troops, you ask? Do you have over 1000 gold? Build even more troops.

    Day 34

  • Get ready for the fourth wave. You shouldn't have a problem with her.
  • Consider building a double stone wall.

    34-41 Day

  • Your gold income is 1200-2000.
  • Continue repeating all of the above.
  • Build a foundry.
  • If you have enough gold, start exploring the oil platform.
  • Get oil.
  • Research engineering.
  • Explore Thanatos or Titan.
  • Keep looking for more room to expand.
  • Continue housing construction.
  • Start exploring and strengthening the narrow entrances between mountains, water, and forest where you held back the last wave.

    Day 41

  • Get ready for the fifth wave.
  • You have 2 ballistae, a double stone wall and your troops are ready to repel the attack.

    41-47 Day

  • Your gold income is 1500-2500.
  • Start building thanatos and / or titans.
  • Get more oil.
  • If you succeed at this stage, you should have half the map captured. In this case, stop expanding.
  • Focus on remodeling all residential buildings.
  • Expand just to get more energy and food for your economy.
  • Continue to kill all the ghouls on the map.
  • Destroy all the remaining Dead Villages and collect their resources.

    Day 47

  • Get ready for the sixth wave.
  • Destroy it.
  • Do you see how cool titans and titans are? Create more units like this!

    47-54 Day

  • Your gold income 2000-3000
  • Continue cleaning the map.
  • Keep increasing your gold income.
  • Continue making small expansions of the area.
  • Continue building troops.
  • Build more ballistas against your walls.

    Day 54

  • Prepare for the seventh wave and destroy it.

    54-60 Day

  • Your gold income is 3000+.
  • Continue doing everything described earlier.

    Day 60

  • Get ready for the eighth wave.

    60-66 Day

  • Continue to upgrade buildings and improve free space.
  • Start building a double stone wall around your entire property.
  • Start upgrading your first line of ballistae.

    Day 66

  • Get ready for the ninth wave.

    66-72 Day

  • Stop upgrading residential buildings.
  • Focus on upgrading all your ballistas.
  • Use all additional resources to create more troops.
  • Place 'Mechs and snipers along the entire line of defense.
  • Place your archers in the middle of the map as mobile forces.
  • Use earlier waves to study how the final wave attacks your defenses.
  • Your gold income should drop below half, which is quite normal.

    Day 72

  • Prepare for Wave XNUMX. Do not worry.
  • Close your potential weak spots and send archers and remaining dormant troops
  • Once the zombie spot is clear enough, send all your troops to the following locations.
  • If they look like they will break through in one place (and you have no troops in this radius), just build random walls around. They don't have to look pretty or effective, they just buy you time. Send troops to help.
  • If the zombies break through, let your troops retreat so they can defend themselves again.
  • There should always be a wall between you and the wave.
  • If you need more gold or stone, sell any remaining oil and iron.

    75-80 Day

  • Wait for the finale and get ready for the next map.

    How to react to a Zombie Village


    Zombie Villages or Dead Villages are fallen colonies. If not destroyed in time, they can spawn zombies and will amplify the final wave.

  • Random noise will trigger 1-5 horde runners (for example, shooting zombies near a village), small events will trigger slow walkers (your building is too close to the village).
  • The village buildings have a finite number of zombies, so you can just wait.
  • The destroyed buildings of the Lost Village drop 4 random resources. 1000 gold or 20 of each resource.

    How to react:

  • If you find a village too early, do not approach it.
  • Don't attack zombies near the village.
  • Build a wall.
  • Until you learn ballista, expand in other directions.
  • Build 2 ballistae behind a double wooden wall (or single stone wall).
  • Using rangers, carefully lure zombies out of the village and direct them to the ballistae.
  • Destroy and rob buildings.

    Warning:

  • Don't waste time on Lost Village at first. This can seriously delay you as you will waste time and resources.
  • Don't be too aggressive. Unless you're raiding a village, you don't need additional enemies.
  • If you stumble upon a village too early, try to distract their attention with one ranger. Don't run straight back to your colony, they will follow you!
  • Don't try to expand through the village. Even if you manage to destroy zombies, you will waste too much time.
    They Are Billions - 80 Days Tips

    They Are Billions - 80 Days Tips

    How to survive the final wave


  • Build enough ballistae. They are cheap in the later stages of the game as they only cost a few workers, 3 energy, wood and gold.
  • Build double walls. Your top priority is to keep the hordes away from your first line of towers. The tower can shoot at 5 rows of walls. You cannot build more than two rows of walls next to each other, so draw two double wall lines. This should hold back the last wave for some time.
  • Think about return lines. A fallen defensive line is not a loss. Remember all the places where your troops can return, and where you can create another wall to stop the dead.
  • Divide your troops between lines of defense. Send at least 1 thanatos to each line of defense.
  • Watch your defenses every second. If some place copes well with the defense, take all the troops from there and send them to more difficult positions. Never let your soldiers sit idle in the last wave.
  • Make tough decisions. Sometimes you have to sacrifice part of your colony so that your troops can retreat and group up in a narrower position.
  • Set the right priorities for your defense. Select "Nearest Target" for rangers and soldiers, and "Top Priority" for all towers, snipers and mechanical units.

    Additional Information


    1. What is the radius of the market and bank, and how should I build my city?

    They Are Billions - 80 Days Tips

    They Are Billions - 80 Days Tips

    Don't build houses outside this radius, it's not worth it.

    2. How should I react to the Lost Village near my base?

    They Are Billions - 80 Days Tips

    They Are Billions - 80 Days Tips

    3. What do you mean by double wall? What does the corresponding protection look like?

    They Are Billions - 80 Days Tips

    4. Do not use extended buildings. They are extremely expensive and ineffective.

    5. What do you mean by narrow passages?

    They Are Billions - 80 Days Tips



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