Around twenty boxes carry the Pandemic name. Exactly three of them expand the original Pandemic board game. The rest are standalone games that share a title and almost nothing else — and a couple of those standalone games have expansions of their own, which also do not work with the base game.
That is the single most useful thing to know before spending money here, because the retail shelf gives you no clue. Pandemic Legacy, Iberia, Fall of Rome and Reign of Cthulhu all sit next to the base game looking like add-ons. None of them is. Buy one expecting more Pandemic and you have bought a different game with its own board, its own deck and its own rules.
So this ranking is short. Here are the three real expansions, in the order worth buying them, and then an honest account of what everything else actually is.
Every requirement and component count below comes from Z-Man Games’ own product pages rather than retailer listings, which get this particular line wrong more often than most.
Some links below are Amazon affiliate links — as an Amazon Associate, King Panda Games earns from qualifying purchases at no extra cost to you. Full disclosure.
1. On the Brink — Buy This One First
Requires the base game · 2–5 players · 2009
On the Brink is first on merit and first on necessity, which makes the decision easy.
On merit: it adds three challenge modules that can be played separately or stacked together. Virulent Strain makes one disease progressively nastier as the game goes on. Mutation introduces an unpredictable fifth disease. Bio-Terrorist hands one player a secret role working against the team, which turns a purely cooperative game semi-competitive — the biggest single change any Pandemic product makes to the base experience. Z-Man’s current product page lists seven new role cards; earlier and revised printings are listed with eight, so secondhand copies vary. The player cap rises from four to five either way.
On necessity: In the Lab cannot be played without it. Z-Man lists On the Brink as a requirement, so if you intend to own all three expansions eventually, this one is not optional and not skippable.
Buy it when: you have won a few games on Standard difficulty and want the game to fight back.
2. State of Emergency — More Challenges, No Prerequisite
Requires the base game only · 2–4 players · 2015
State of Emergency is the other module box, and its appeal is that it stands alone against the base game — no On the Brink required.
It adds three more challenges. Hinterlands brings two extra boards and a die, with diseases jumping from animals to humans in regions outside the main map. Superbug adds a fifth disease that cannot be cured the normal way; you produce vaccine doses to eradicate it instead, using vaccine factories included in the box. Emergency Events layers unpredictable penalties onto the game — restricted movement, reduced hand size — and Z-Man flags it as the module for experienced players. Five new role cards and quarantine tokens round it out.
Why it is second, not first: it caps at four players, so unlike On the Brink it seats nobody new, and none of its modules reshapes the game the way the Bio-Terrorist does. It is more of what you already like, which is a fine thing to buy second and a poor thing to buy first.
3. In the Lab — The One That Changes the Job
Requires the base game and On the Brink · 1–6 players · 2013
In the Lab is last because it asks the most of you, not because it is the weakest.
It adds a second board. Instead of curing a disease by turning in five matching cards, you collect physical samples in the field, then take them to the lab to sequence, characterize and test a cure. That is a genuine change to the core loop rather than a modifier on top of it, and it lengthens the game.
It also does something neither of the others does: it takes the player range to 1–6, adding a formal solo mode at one end and rival-team play at the other, where four or six players split into competing teams. If you mostly play Pandemic alone or with a big group, this is arguably the expansion you want most — it is only ranked third because you have to own On the Brink first to get there.
Buy it when: you have both other boxes, or you specifically want solo and six-player support.
The Buying Order
| Order | Expansion | Requires | Players | Why |
|---|---|---|---|---|
| 1st | On the Brink | Base game | 2–5 | Most content, adds a 5th seat, required for In the Lab |
| 2nd | State of Emergency | Base game | 2–4 | Three more challenges, no prerequisite |
| 3rd | In the Lab | Base + On the Brink | 1–6 | Changes the cure loop; adds solo and 6-player |
If you only ever buy one, buy On the Brink. If you only ever buy two, add State of Emergency unless you play solo, in which case In the Lab is the better second purchase.
The Fifteen Boxes That Are Not Expansions
This is where most of the money gets spent by mistake, so it is worth being precise. None of the following needs the base game, and none of them combines with it.
The Legacy seasons — Season 1 (2015), Season 2 (2017) and Season 0 (2020) are campaign games played over roughly a dozen sessions, with components you permanently alter. Each is a complete game in its own right. Season 1 is the usual entry point despite the numbering.
The historical and thematic reskins — Iberia (2016), Rising Tide (2017), Fall of Rome (2018) and Reign of Cthulhu (2016) each rebuild Pandemic around a different setting with meaningfully different rules. They are standalone games, not skins over the same board.
The small-box versions — Hot Zone: North America (2020) and Hot Zone: Europe (2021) are shorter, cheaper, travel-sized games. These two mix with each other, and with nothing else.
The different-genre spinoffs — The Cure (2014) is a dice game, Contagion (2014) casts you as the diseases, and Rapid Response (2019) is real-time. Same brand, different genres entirely. The Cure even has its own expansion, Experimental Meds, which requires The Cure and does nothing for the original board game — a neat illustration of how separate these lines are.
The licensed titles — World of Warcraft: Wrath of the Lich King (2021), Star Wars: The Clone Wars (2022) and The Lord of the Rings: Fate of the Fellowship (2025) apply the Pandemic engine to licensed settings, standalone in every case.
Buying any of these is a perfectly good decision. Buying one because you wanted more Pandemic is the mistake this section exists to prevent.
Where Pandemic Sits Against Other Co-ops
If you already own Pandemic and its expansions and want the next step up in difficulty, two games we have covered go further. Ghost Stories is markedly harder and less forgiving — we put the two head to head in Ghost Stories vs Pandemic. Spirit Island is the heavier, deeper option, and its own expansion line is far larger than Pandemic’s three boxes; it also has the best solo mode of the three.
For more on which add-ons are worth the money across the hobby, see the best board game expansions. Pandemic itself remains one of the best games for families and holds up well at four players.
Frequently Asked Questions
How many Pandemic expansions are there?
Three expand the original Pandemic board game: On the Brink (2009), In the Lab (2013) and State of Emergency (2015). Every other box carrying the Pandemic name is a standalone game with its own board and rules, not an add-on. That includes all three Legacy seasons, Iberia, Rising Tide, Fall of Rome and Reign of Cthulhu.
Which Pandemic expansion should I buy first?
On the Brink. It adds the most content, raises the player cap to five, and it is a hard prerequisite for In the Lab, so buying anything else first can leave you with a box you cannot play.
Does Pandemic In the Lab need On the Brink?
Yes. Z-Man Games states that both the Pandemic base game and the On the Brink expansion are required. Some retailers list In the Lab as needing only the base game, and at least one sells it under the title “Expansion for Pandemic: On the Brink” — check before you buy secondhand.
Is Pandemic Legacy an expansion?
No. All three Legacy seasons are complete standalone games with their own boards, decks and components. You do not need the original Pandemic to play any of them, and they do not combine with it.
Can you combine the Pandemic expansions?
Yes. The challenge modules are designed to stack — you can run Virulent Strain from On the Brink alongside Emergency Events from State of Emergency, for example. Combining several at once is how experienced groups push the difficulty past what the base game offers.
Which Pandemic expansion supports the most players?
In the Lab, at 1 to 6 players, and it is the only one that adds a formal solo mode. On the Brink supports 2 to 5. State of Emergency supports 2 to 4, so it adds no players over the base game at all.
Do the Pandemic expansions work with Iberia or Fall of Rome?
No. The standalone titles are self-contained and are not cross-compatible with the original Pandemic or with each other. The one exception is the Hot Zone series, whose two boxes mix with each other but not with the full-size games.