Portal 2 Chamber Count Comparison (Chapters)
Compare 13 Portal 2 chamber shares: Cold Boot 8, Return 9, Itch 11 plus co-op courses. Chapter section counts cited here now. With bars, table and ratios.
Visual comparison
All values
Click any row to load it as Entry A.
| Name | Value | Context | Source |
|---|---|---|---|
| Chapter 2 Cold Boot Cleanest row. 8 maps, 8 numbered chambers. | 8 chambers | GLaDOS chambers 01 to 08 | Portal Wiki List of Portal 2 chambers Chapter 2; IGN Chapter 2 walkthrough 1-8 |
| Chapter 3 The Return Clean. 9 maps, 9 numbered chambers. | 9 chambers | GLaDOS chambers 09 to 17 | Portal Wiki List Chapter 3; IGN Chapter 3 walkthrough 9-17 |
| Chapter 1 Courtesy Call 9 numbered 00 to 08 packed in 7 maps. Chambers 03-04 and 07-08 share maps. | 9 chambers | Intro maps plus wakeup and incinerator | Portal Wiki List Chapter 1; GamesRadar Chapter 1 chambers 00 to 08 |
| Chapter 8 The Itch Highest here. Numbers skip cut chambers 07-10, 13-14. | 11 chambers | Wheatley rebuilt chambers, highest | Portal Wiki List Chapter 8: 11 sections |
| Chapter 4 The Surprise 5 maps. Wiki shows 4 bullets, escape shares one. | 5 chambers | Chambers 18-20 plus escape 21-22 | Portal Wiki internal maps: column blocker, laser chaining, triple laser, bts1, bts2 |
| Chapter 5 The Escape 0 numbered chambers. Turret factory to GLaDOS lair. | 5 chambers | Behind scenes escape sections | Portal Wiki List Chapter 5: 5 sections |
| Chapter 6 The Fall Crazy Box holds numbered 27 and 28 in one map. | 7 chambers | Old Aperture enrichment spheres | Portal Wiki internal maps Chapter 6: 7 maps |
| Chapter 7 The Reunion Conversion intro map holds 2 numbered gel tests. | 4 chambers | Propulsion and conversion gels | Portal Wiki List Chapter 7: 4 sections |
| Chapter 9 Kill You Turret Opera outro excluded as non test. | 4 chambers | Finale maps 1 to 4 | Portal Wiki internal maps Chapter 9: finale1-4 |
| Chapter 10 Credits Lowest here. 0 test chambers. | 1 chambers | Want You Gone outro only | Portal Wiki List Chapter 10: credits map |
| Co-op Calibration Hub Intro section row. | 2 chambers | Co-op intro and lobby | Portal Wiki List Co-op: Calibration plus Hub |
| Co-op Course 1 Team Building Clean co-op row. | 6 chambers | Co-op chambers 01 to 06 | Portal Wiki List Co-op Course 1: 6 sections |
| Co-op Course 4 Excursion Funnels Tied with Chapters 1 and 3. | 9 chambers | Co-op chambers 01 to 09, largest course | Portal Wiki List Co-op Course 4: 9 sections |
About this converter
Portal 2 splits its campaign into chapters with fixed section counts on the Portal Wiki chamber list. Chapter 2 holds 8 GLaDOS chambers 01 to 08. Chapter 3 holds 9 chambers 09 to 17. Chapter 1 holds 9 numbered 00 to 08 packed into 7 maps. Chapter 8 holds the most at 11 Wheatley sections with cut numbers skipped. Chapters 4 and 5 hold 5 each, one of tests and one of escape. Chapter 6 holds 7 old Aperture maps. Chapter 7 holds 4 gel sections. Chapter 9 holds 4 finale maps. Chapter 10 holds 1 credits outro. Co-op adds Calibration Hub at 2, Team Building at 6 and Excursion Funnels at 9. Every figure here is the listed section count from Portal Wiki with IGN and GamesRadar walkthrough cross checks.
How to use it
Pick two entries and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. Try 1 Chapter 8 against 1 Chapter 10 to see the largest to outro gap. The ratio line prints how many times larger one share is.
Numbered chambers and internal maps differ in four spots, flagged per row: Chapter 1 packs 9 numbers into 7 maps, Chapter 4 escape shares a bullet, Chapter 6 Crazy Box holds 27 and 28 together, and Chapter 7 conversion intro holds 2 tests. Chapter 5 has zero numbered chambers and counts escape sections instead. Turret Opera stays out as a non test outro.
FAQ
Which chapter has the most chambers?
Chapter 8 The Itch with 11 Wheatley sections. Numbering skips cut chambers 07-10 and 13-14.
How many chambers in Chapter 2?
8, numbered 01 to 08. Chapter 3 continues 09 to 17 with 9.
Why do maps and chambers differ?
Some maps hold two numbered tests, like Crazy Box with 27 and 28. The table counts listed sections and flags each case.
Does co-op count here?
Yes, three rows: Calibration Hub 2, Team Building 6 and Excursion Funnels 9.
Sources
- Portal Wiki: List of Portal 2 chambers (per chapter sections and internal map names)
- IGN Portal 2 Walkthrough hub and chapter videos (Chapters 2, 3, 8 cross check)
- GamesRadar Portal 2 walkthrough guide (Chapter 1 chambers 00 to 08)
- Valve Portal 2 in-game chapter structure (base values)
Last verified: 2026-10-04 · 13 entries
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