About Portal 2: The Underground 4/5
What the creator says, alongside confirmed listing details.
Portal 2: The Underground 4/5 is a community item for Left 4 Dead 2 listed on Steam Workshop.
The underground from Portal 2 ported into Left For Dead 2, and converted into a campaign, and two survival maps. All content is packed so you dont need Portal 2...
Mod details
- Game
- Left 4 Dead 2
- Creator
- The Mafia
- Category
- Unclassified
- Published
- March 10, 2020
- Last Workshop update
- March 16, 2020
- Workshop item
- #2019086837
Screenshots
1 image from the mod listing
Timeline
Key dates from the original listing and ModOrNot's catalogue.
-
First published
The item was first published on Steam Workshop. Steam listing ↗
-
File last updated
Latest file-change date reported by Steam Workshop. Steam listing ↗
Why it ranks here
Portal 2: The Underground 4/5 has 16,184 subscribers and ranks #6,167 in Left 4 Dead 2 (#6,167 overall). Over the last 7 days it gained +15 subscribers (+0.1%) and over 30 days 0. Weekly velocity is 0.0 subs/day, accelerating (0.00).
Metrics from 16 stored snapshots. How ModOrNot ranks mods →
Subscriber change since tracked
View change since tracked
Favorite change since tracked
Platform availability
Xbox 360 version, backward compatible on Xbox One/Series X|S. Add-on content is Steam Workshop only; console builds do not run Workshop mods.
Availability is only claimed when an official source proves it. A platform we cannot verify is shown as “Not verified” — we never assume a PC Workshop mod runs on a console.
More Left 4 Dead 2 mods
| Mod | Subscribers | 7d | Score |
|---|---|---|---|
| 593 | +513 | 100.0 | |
| 927 | +830 | 100.0 | |
| 767 | +604 | 100.0 | |
| 526 | +391 | 100.0 | |
| 2.3K | +2.2K | 100.0 |
Frequently asked questions
How popular is Portal 2: The Underground 4/5 compared with other Left 4 Dead 2 mods?
It ranks #6,167 among 179,001 tracked active Left 4 Dead 2 mods by subscribers — within the top 3.45%. This is a subscriber-based position, not a quality verdict. Counts and placement can change as the catalogue updates.
Is Portal 2: The Underground 4/5 available on PC?
The official Steam Workshop listing establishes PC distribution for Left 4 Dead 2. This does not verify current downloadability or compatibility with every PC configuration. Official source ↗
Is Portal 2: The Underground 4/5 available on PlayStation 5?
No — Left 4 Dead 2 itself is not available on PlayStation 5, so neither the game nor its mods can run there.
Is Portal 2: The Underground 4/5 available on Xbox Series X|S?
No — Left 4 Dead 2 exists on Xbox Series X|S, but its mod system does not support Portal 2: The Underground 4/5. Xbox 360 version, backward compatible on Xbox One/Series X|S. Add-on content is Steam Workshop only; console builds do not run Workshop mods.
When was the mod last updated?
The source listing reports March 16, 2020 as the last file update. A later comment or catalogue refresh does not mean the mod file changed. Official source ↗
What does the ModOrNot Score mean on this page?
It is a 0–100 momentum signal: 50% subscriber-growth velocity relative to mods in the same game, 20% favorite growth, 20% view growth, and 10% update recency. It is not a quality rating. The current score is 73.8.
Are these the real Steam Workshop numbers?
ModOrNot stores public Steam Workshop counts from its collection runs. The totals shown here are the latest counts stored in our catalogue; changes over time are calculated from recorded observations, not invented values. They can differ from the live listing until the next collection.
How is the rank computed?
ModOrNot compares tracked active Left 4 Dead 2 mods by their current stored subscriber totals. Rank #1 has the most subscribers; equal totals share a rank. The rank is calculated when this page loads and can change as counts or the catalogue change.