What Is COR3? cor3.gg ARG Walkthrough, Acts, Quests & Achievements

Short answer

COR3 is two things: the direct-to-consumer PC platform that publishes Fragmentary Order, and cor3.gg, a browser ARG styled as a corporate operating system. Story quests run in acts (Act 1 tutorial loops, Act 2 from February 1, 2026, Act 3 with drone building). Progress earns credits, Renown and a rank that lowers your Prime Batch price.

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COR3 in one minute

The name does double duty, which is why searches for it are confusing.

COR3 the platform. GamesBeat describes COR3 as a direct-to-consumer PC publisher and platform. Fragmentary Order is its first major title and is published only there.
cor3.gg the ARG. A free browser game dressed as the operating system of Core, the corporation that runs the Solar System in 2251. You read documents, repair files, talk to characters in a messenger and type commands in a terminal. When the project was named in April 2026, early access was described as something you earn here by "conducting system research, establishing a foundation, and increasing their standing."

The two connect through your rank. What you do on cor3.gg sets a rank, and the rank lowers your Prime Batch price.

An empty wireframe hall in front of a sealed octagonal door — The bunker hatch from fragmentaryorder.com, before the operator steps in.Official media © Rant Gaming / COR3

What is on the desktop

Going by the folders the community archived, the cor3.gg "OS" includes:

App or folder	What it holds
Browser	In-fiction websites: forums, archives, trade shipments
Messenger	Conversations with characters, plus a news channel
Terminal	Commands for servers you break into
Codex	The in-game encyclopedia, updated as you progress
MR-7 Media Reader	Files from storage devices once you repair or decrypt them
Documents and Reports	PDFs and scans: experiments, interrogations, after-action reports
Expeditions	Drone expeditions in Act 3

How the story is structured

Story content comes in acts, and each act is split into loops (chains of puzzles). The archive's file index shows the shape:

Act 1, loops 0 to 4. Loop 0 is the tutorial. Solving the first four loops unlocks a ship-to-Mars ticket banner.
The first countdown. That banner led to a page counting down to February 1, 2026, 15:00 GMT. Act 2 began after it.
Act 2. Includes repairing the MR-7 Media Reader and a private server. After it, a second ship banner counted down to April 12, 2026, 17:00 GMT, the day the game was named Fragmentary Order.
Act 3. Includes building and certifying your personal expedition drone, and a server that "didn't survive the intrusion".

Alongside the acts run Daily Ops (short daily tasks), timed events and a monthly news feed of numbered stories.

Known quest numbers

Quest names as they appear on cor3.gg, per the community archive. The numbering is cor3.gg's own.

Number	Quest
300	Onboarding
301	Broken server
302	Ghost Protocol
303	Wings of Mars
402	Fragile deal
−300	Hacker's stuff
−301	A deal with the unknown
−601	Black Ledger
?01	Expansion of the stash
?01	Private Matters

Quest 303, Wings of Mars, matters more than the rest: completing it is one of the four conditions for The Pillar rank. The news feed adds stories numbered −801 onward, grouped by month from June (−851) to December (−857), with titles like "Orbit-12", "RepEnt do not sleep" and "Aliens on Mars".

Spoiler: who you meet in Act 2Click to reveal

Act 2's private-server thread ends with conversations with Vladimir Semakin and James Curtis Fung, which unlock the second ship countdown.

All known achievements

Achievement	How to get it	Category
The First Step	Complete Quest 0 in Act 1	Act 1
Firewall	Block the hacker in Quest 2	Act 1
First to Board	First player to move to Act 2	Act 2
Mechanic	Repair the Reader in Act 2	Act 2
Blind Star	Find the right star in Side Quest 3	Act 2 side
My name is roomba	Fix the cleaning robot in Side Quest 5	Act 2 side
Wings of Reach	Build and certify your expedition drone	Act 3
Money Talks	Pay full price for every drone part	Act 3
Scrounger	Not documented (the scavenging route, by its name)	Act 3
Compromised Server	Connect to a system that didn't survive the intrusion	Act 3
First Shift	Complete Daily Ops once	Daily
Discipline	Complete Daily Ops 15 days in a row	Daily
First Credit	Earn your first credits	Credits
Getting Paid	Earn 5,000 credits	Credits
I Was Here	Take part in an event while it's live	Event
Every Small Signal	Complete every daily micro side quest	Event
The Main Thread	Complete the main event quest	Event
I Saw It Through	Complete the full event while it's live	Event

How to approach the puzzles

Read everything twice. It is an ARG: documents, file names and odd characters are where clues hide.
Keep a notes file. Names, codes and dates are easy to lose between acts.
Do Daily Ops. Two achievements depend on them, and Discipline needs 15 days in a row.
Watch your credits. The Pillar counts total credits earned, not your current balance.
Track events. Event completion is a Pillar condition, and some event achievements only count while the event is live.
Stuck? The community's public archive and living walkthrough have file-by-file notes. Treat them as spoilers.

Next: COR3 ranks explained, or check yours with the rank checker.

Common questions

What is COR3?

COR3 is the PC platform and publisher behind Fragmentary Order, and also the name of the in-world megacorporation’s system. cor3.gg hosts an alternate-reality game that works as the game’s front door.

Is cor3.gg free?

Yes. The ARG is free to play in a browser. Only Prime Batch, the testing program, costs money.

Does COR3 progress matter for Fragmentary Order?

Yes. Your COR3 rank lowers the Prime Batch price and sets your priority for First Batch access. cor3.gg says progress carries forward.

Where can I find COR3 puzzle solutions?

The community keeps a public archive of cor3.gg text and assets on GitHub (3ncy/cor3) and a living walkthrough document. This page covers structure; spoilers stay in collapsed blocks.