Did Pandemic Legacy: Season 1 come true?
Largely, yes. Pandemic Legacy: Season 1 (2015) has a P(n) of 83% on Nearfi's P(n) Board, our estimate of the chance its future arrives within 20 years. Of its 5 tracked predictions, 3 have arrived and 1 are arriving. Its central premise, 'A new disease spreads between distant cities of the world within weeks, travelling along the links between them', has arrived. The next prediction is estimated to arrive around 2032.
Pandemic Legacy's world is a gameboard, not a forecast, but its main mechanics landed in 2020: a new disease moving between distant cities, whole cities sealed off, and strains that change the rules. The response it assumes, a team that shares everything, is still being drafted, and the civilisational collapse it can end in has not happened.
Read the review · 8.4/10 →
How this P(n) was calculated
P(n) is the chance that this work's future arrives within 20 years, by 2046. For each prediction we turn our estimate into a probability: arrived is 100%, diverged is 0%, and otherwise the low end of our 80% range counts as a 10% chance, the median year 50% and the high end 90%. Each prediction is weighted 1–5 by how pivotal it is to the story, and P(n) is the weighted average. P50 does the same by 2076. P(n), explained.
| Claim | Prediction · why this weight | Weight | Status · estimate | By 2046 | By 2076 |
|---|---|---|---|---|---|
| PANLEG-1 | A new disease spreads between distant cities of the world within weeks, travelling along the links between them. Core premise: every month of the campaign is a race against an outbreak moving city to city. |
5 | ARRIVED arrived 2020 | 100% | 100% |
| PANLEG-2 | Authorities seal off whole cities, halting transport in and out, to contain an outbreak. Supporting: quarantining and closing cities is a core tool in play, though not the story's engine. |
3 | ARRIVED arrived 2020 | 100% | 100% |
| PANLEG-3 | A disease mutates during the outbreak into strains that defeat the previous response. Major: mutation is what turns each month's rules over and drives the campaign's escalation. |
4 | ARRIVED arrived 2021 | 100% | 100% |
| PANLEG-4 | Nations pool knowledge and resources into one cooperative international response to pandemics. Major: the game's central premise is that the only way to win is to cooperate. |
4 | ARRIVING 2032 (2028–2045) | 91% | 100% |
| PANLEG-5 | A pandemic kills so large a share of humanity that civilisation collapses. Supporting: collapse is the stake a lost campaign points at, and the sequel's setting, not the core loop. |
3 | FAR 2150 (2075–2300) | 4% | 11% |
| P(n) = P20 = Σ(weight × chance by 2046) ÷ Σ weight = 15.8 ÷ 19 = 83% | |||||
| P50 = 16.3 ÷ 19 = 86% | |||||
Already here today (arrived 1, arriving ½, weighted): 74%.
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PANLEG-1
A new disease spreads between distant cities of the world within weeks, travelling along the links between them.
Weight 5/5 · Core premise: every month of the campaign is a race against an outbreak moving city to city.
SARS-CoV-2 was first reported in Wuhan in December 2019 and had been declared a pandemic by March 2020. A 2021 review estimates about five million people left Wuhan before it was locked down and links early departures to how far infection spread within China. The game's board connects cities by simple lines, and one epidemiologist told NPR in 2015 that air traffic is not modelled in it, but the pattern it dramatises is the one that played out. 123
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PANLEG-2
Authorities seal off whole cities, halting transport in and out, to contain an outbreak.
Weight 3/5 · Supporting: quarantining and closing cities is a core tool in play, though not the story's engine.
Wuhan was closed on 23 January 2020, with flights, trains, buses and ferries suspended, and neighbouring Huanggang and Ezhou followed the same day. Lockdowns of cities and then countries became routine in 2020. The cost was real, and the sealing came after many people had already left, which limits how well the tool worked. 45
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PANLEG-3
A disease mutates during the outbreak into strains that defeat the previous response.
Weight 4/5 · Major: mutation is what turns each month's rules over and drives the campaign's escalation.
SARS-CoV-2 produced a succession of variants. The WHO classified Omicron, with a large number of mutations and signs of increased reinfection, as a variant of concern on 26 November 2021, two days after South Africa reported it. The game's strain becomes untreatable; reality has not, and vaccines kept protecting against severe disease. WHO now lists no variants of concern in circulation. 67
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PANLEG-4
Nations pool knowledge and resources into one cooperative international response to pandemics.
Weight 4/5 · Major: the game's central premise is that the only way to win is to cooperate.
The World Health Assembly adopted the WHO Pandemic Agreement in May 2025 without a vote against, but it cannot be opened for signature until a pathogen access and benefit-sharing annex is agreed, and in May 2026 talks were extended again. The United States left the WHO on 22 January 2026. A working agreement is likely, but how much it will bind is open, so we set a median several years out. 8910
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PANLEG-5
A pandemic kills so large a share of humanity that civilisation collapses.
Weight 3/5 · Supporting: collapse is the stake a lost campaign points at, and the sequel's setting, not the core loop.
COVID-19 caused an estimated 14.9 million excess deaths in 2020 and 2021, a catastrophe, but a small share of humanity, and societies kept functioning. The Black Death, by various estimates, killed 25 to 60 per cent of Europe's population, which shows that collapse-scale mortality has happened, but medicine, surveillance and vaccines have changed since. A global collapse is possible in principle, and the range is wide to reflect that. 1112
- FOR WHO Timeline - COVID-19. World Health Organization, 2020-04-27. Dated record of the outbreak from the first reports in December 2019 to the pandemic declaration.
- FOR New Coronavirus (SARS-CoV-2) Crossing Borders Beyond Cities, Nations, and Continents: Impact of International Travel. Balkan Medical Journal, 2021-07-01. Review finding that travellers leaving Wuhan before the lockdown were a main source of infection for other Chinese cities.
- CONTEXT This Holiday Season, Give The Gift Of World Disease. NPR (via WAMC), 2015-12-19. An epidemiologist who played the game said it was designed to entertain rather than be realistic, and that air traffic is not modelled.
- FOR China locks down Wuhan over coronavirus spread. Fortune, 2020-01-23. Reports transport out of Wuhan stopped and Huanggang and Ezhou placed under a travel ban, with nearly 20 million people affected.
- AGAINST New Coronavirus (SARS-CoV-2) Crossing Borders Beyond Cities, Nations, and Continents: Impact of International Travel. Balkan Medical Journal, 2021-07-01. About five million people left Wuhan before the lockdown, so the seal came after the virus had travelled.
- FOR New COVID-19 variant of concern named Omicron. WHO Europe, 2021-11-29. WHO names a heavily mutated variant a variant of concern days after it was first reported.
- AGAINST Tracking SARS-CoV-2 variants. World Health Organization, 2026-07-28. Lists no currently circulating variants of concern, only variants of interest and under monitoring.
- FOR World Health Assembly adopts historic Pandemic Agreement to make the world more equitable and safer from future pandemics. World Health Organization, 2025-05-20. Adopted by consensus. It enters into force after 60 ratifications and cannot override national laws.
- AGAINST WHO Member States agree to extend negotiations on pathogen access and benefit sharing annex. World Health Organization, 2026-05-01. Annex not finished, so signature and ratification cannot yet begin.
- AGAINST HHS Fact Sheet: U.S. Withdrawal from the World Health Organization. US Centers for Disease Control and Prevention, 2026-01-22. The US formally left the WHO on 22 January 2026 under Executive Order 14155.
- AGAINST 14.9 million excess deaths were associated with the COVID-19 pandemic in 2020 and 2021. World Health Organization, 2022-05-05. A severe toll, but nowhere near collapse-scale mortality.
- CONTEXT Black Death. Wikipedia, 2026-11-05. Estimates 25 to 60 per cent of Europe's population died in the 14th century.
Ledger updated 5 Nov 2026. All works on the P(n) Board · Method