Ndemic Creations brought Plague Inc: Evolved out of Early Access on 18 February 2016, rebuilding the 2012 mobile game with a larger world map, custom scenarios and Steam Workshop support. You seed one of seven standard plague types in a single country and spend DNA points across Transmission, Symptoms and Abilities until every country on Earth is infected. The cure runs on its own clock funded by wealthy nations, so the entire game is a race between an infection curve you control and a research bar you can only slow.
This guide covers everything you need: core mechanics, the best builds, equipment worth investing in, location progression, and the tips that actually make a difference.
Core Mechanics
DNA points and bubble popping
Red bubbles on infected countries and orange bubbles on newly infected ones are the main income, and blue cure bubbles slow the research bar. Genes change the yield: ATP Boost hands over 8 extra DNA at the start, Metabolic Jump raises the red bubble payout, Cytochrome Surge raises the orange, and Catalytic Switch pulls 2 to 5 DNA out of blue bubbles that would otherwise only slow the cure.
Transmission, Symptoms and Abilities trees
Transmission covers Air 1 and 2, Water 1 and 2, and the animal vectors, and it is where almost all early DNA belongs. Abilities cover Cold Resistance, Heat Resistance, Drug Resistance and Genetic Hardening, which decide whether Greenland and Saudi Arabia are reachable at all. Symptoms are the lethality tree and the one that gets you noticed, which is why they come last.
Mutation and devolving
Symptoms mutate on their own, and every mutation raises severity, which raises awareness, which speeds the cure. Devolving an unwanted symptom costs DNA on an escalating scale, so a run that ignores stray mutations for ten minutes cannot afford to clean them up afterwards. Darwinist raises the mutation rate and Creationist lowers it.
Cure research and country funding
Rich countries pour money into the cure, so infecting them early is a trade rather than a straight win. Genetic Hardening 1 and 2 and the Genetic ReShuffle line push the requirement upward, and Prion's Neural Atrophy slows research outright by damaging the brains of the scientists working on it.
Genes chosen before the run
The gene loadout is set before the first click and cannot be changed mid game. Travel genes Aerocyte, Aquacyte and Teracyte boost air, sea and land spread, Native Biome raises infectivity in your starting country, the environment genes Xerophile, Hydrophile, Rurophile and Urbophile favour specific terrain, and Sympto-Stasis cuts the cost of the full 32 symptom tree from 779 DNA to 283.
For a deeper dive into how these systems interact, see our Plague Inc: Evolved combat guide.
Builds Overview
| Build | Tier | Playstyle | Key Stats |
|---|---|---|---|
| Bacteria | A | Versatile approach | Balanced stats |
| Virus | A | Versatile approach | Balanced stats |
| Prion | A | Versatile approach | Balanced stats |
| Nano-Virus | A | Versatile approach | Balanced stats |
| Bio-Weapon | A | Versatile approach | Balanced stats |
For full build breakdowns with gear and stat priorities, see our Plague Inc: Evolved builds guide. For rankings, check the tier list.
Equipment Guide
| Equipment | Why It Matters | Best For |
|---|---|---|
| Air 2 | The second tier of airborne transmission, and the single most valuable early purchase for a plague starting somewhere with heavy air traffic. | Reaching distant countries from a well connected starting nation |
| Water 2 | The naval counterpart to Air 2, and the reason island nations get infected before they close their ports. | Infecting islands before ports close |
| Cold Resistance 2 | Cold climates block infection outright without it, which is what strands runs at Greenland, Iceland and northern Russia. | Greenland, Iceland, Canada and northern Russia |
| Genetic Hardening 2 | Raises the amount of research needed to complete the cure, which is the only lever that directly attacks the losing condition. | Brutal and Mega Brutal runs where the cure finishes first |
| Total Organ Failure | The deadliest single symptom in the game at 25 lethality, well ahead of Hemorrhagic Shock at 15 and Necrosis at 13. | The final lethality burst once every country is infected |
Air 2: The second tier of airborne transmission, and the single most valuable early purchase for a plague starting somewhere with heavy air traffic. It is what makes Saudi Arabia's airport connections pay off.
Water 2: The naval counterpart to Air 2, and the reason island nations get infected before they close their ports. Greenland, Iceland, New Zealand, Madagascar and the Caribbean all shut down once the world panics, so Water 2 needs to land before that.
Cold Resistance 2: Cold climates block infection outright without it, which is what strands runs at Greenland, Iceland and northern Russia. Paired with Heat Resistance it removes climate from the equation entirely.
Genetic Hardening 2: Raises the amount of research needed to complete the cure, which is the only lever that directly attacks the losing condition. On Brutal and Mega Brutal it converts directly into extra minutes of spreading time.
Total Organ Failure: The deadliest single symptom in the game at 25 lethality, well ahead of Hemorrhagic Shock at 15 and Necrosis at 13. It belongs at the very end of a run, evolved in the same burst as everything else lethal.
Full breakdowns in our Plague Inc: Evolved weapons guide.
Location Progression
| Location | Level Range | Key Rewards |
|---|---|---|
| Saudi Arabia | All difficulties, recommended default | Fast air spread, land borders and a slow detection curve |
| India | All difficulties, high population start | Very fast raw infection numbers and cheap DNA income |
| China | All difficulties, balanced start | Population volume plus international connections |
| South Africa | All difficulties, island focused start | Early sea routes toward Madagascar and the southern islands |
| Greenland | Challenge start, expert only | The hardest legitimate opening in the standard game |
Saudi Arabia: The standard opener because it carries heavy air and sea traffic while being hot and arid enough to slow early detection. It also borders several land routes, which means a single well placed plague touches three continents quickly.
India: Hot, humid, poor and enormous, which makes it a fast infection base with weak healthcare working in your favour. The trade is that wealthy nations stay clean longer, so the cure clock starts later but the islands are further away.
China: A huge population with strong air and sea links, useful when you want both infection volume and reach from a single country. Its climate range means resistances matter earlier than in a purely hot start.
South Africa: A start with both airports and seaports plus a southern position that reaches the countries most runs leave until last. It is the pragmatic answer when a previous attempt died with Madagascar still grey.
Greenland: A deliberate challenge start rather than an efficient one. Cold, tiny, isolated and quick to close its single port, it demands Cold Resistance and Water transmission before the plague has produced meaningful DNA.
See our maps & locations guide for detailed area breakdowns and our walkthrough for the optimal progression path.
Tips That Actually Matter
- The sequence that beats every difficulty is the same one: buy transmission and resistances until every country is infected, devolve stray symptoms as they appear, then evolve the entire lethality package in one burst. Losses on Brutal and above almost always trace back to evolving a cough too early.
- Greenland, Iceland, New Zealand, Madagascar and the Caribbean close their ports the moment the world panics. Check those five on the map before touching the symptom tree, because a run that ends with one grey island was lost forty minutes earlier.
- Devolving is priced on an escalating scale, so the cost of cleaning up a mutation rises the longer you leave it. Devolve on sight rather than batching them, particularly with Virus where mutations arrive constantly.
- ATP Boost hands over 8 extra DNA at the very start, which on Mega Brutal is roughly the difference between Air 1 on turn one and Air 1 several countries later. Catalytic Switch then converts blue cure bubbles into 2 to 5 DNA each.
- Sympto-Stasis reduces the cost of evolving all 32 symptoms from 779 DNA to 283. That single gene is what makes a complete symptom sweep affordable in the endgame burst.
- Skin Lesions at plus 11 infectivity, Necrosis at plus 10 and Dysentery at plus 8 are the infectivity symptoms, while Total Organ Failure at 25 lethality, Hemorrhagic Shock at 15 and Necrosis at 13 are the killers. Knowing which column a symptom sits in is what makes the final burst efficient.
- The initial six symptoms available at the start are Nausea, Coughing, Rash, Insomnia, Cysts and Anaemia. None of them belong in an early build, they exist so mutations have somewhere to land.
- Nano-Virus starts detected, so the cure begins immediately and the kill switch must be suppressed before anything else. Finishing both of its ability trees unlocks Kill Switch Stasis, which is the point where the run becomes normal.
- Bio-Weapon gains lethality automatically, which kills hosts before they spread. Nucleic Acid Neutralisation exists specifically to hold that back, and Unlock Annihilate Gene only becomes available once all three of its trees are complete.
- Prion's Neural Atrophy slows research and raises the cure requirement, which is why Prion tolerates a slower spread than any other type. It is the most forgiving plague for a player still learning the map.
Common Mistakes to Avoid
- Evolving a symptom early because DNA is sitting unspent. Symptoms raise severity, severity raises awareness, and awareness funds the cure, so unspent DNA is safer than a premature cough.
- Forgetting island nations until the cure is already at 40 percent. Greenland, Iceland, New Zealand, Madagascar and the Caribbean close ports on panic, and there is no way back in afterwards.
- Skipping Cold Resistance on a hot country start. Saudi Arabia and India both spread beautifully until the plague hits Canada and Russia and simply stops.
- Treating Bio-Weapon like Bacteria. Its automatic lethality gain means the standard infect first plan fails unless Nucleic Acid Neutralisation is bought early.
- Ignoring blue cure bubbles because they give no DNA by default. Popping them still slows research, and with Catalytic Switch equipped they pay 2 to 5 DNA on top.
Frequently Asked Questions
Which plague type should a new player start with?
Bacteria. It has no crippling drawback, its Bacterial Resilience line covers hostile climates, and the infect first then kill sequence it teaches transfers to every other type in the game.
What is the best starting country?
Saudi Arabia is the standard answer because it combines major air and sea traffic with a hot arid climate that slows detection. India and China are the high population alternatives, and South Africa helps when islands are the problem.
Why do I keep losing with Madagascar uninfected?
Islands close their ports as soon as global panic rises, and panic rises with symptom severity. Buy Water 1 and 2 and reach the islands before you evolve anything visible.
Which genes matter most on Mega Brutal?
ATP Boost for the 8 extra starting DNA, a travel gene matching your start such as Aerocyte, Sympto-Stasis to cut the symptom tree from 779 DNA to 283, and Genetic Mimic to slow the cure.
What special plagues are included?
Beyond the seven standard types, Plague Inc: Evolved adds the Neurax Worm, the Necroa Virus with its zombie mechanics, the Simian Flu with its ape genes, and the Shadow Plague with blood, flight and shadow genes.
More Plague Inc: Evolved Guides
- Plague Inc: Evolved Best Builds
- Plague Inc: Evolved Tier List
- Plague Inc: Evolved Walkthrough
- Plague Inc: Evolved Beginner's Guide
- Plague Inc: Evolved Tips & Tricks
- Plague Inc: Evolved Weapons Guide
- Plague Inc: Evolved Combat Guide
- Plague Inc: Evolved Boss Guide
- Plague Inc: Evolved Maps & Locations
- Plague Inc: Evolved Crafting Guide
- Plague Inc: Evolved Classes & Characters
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