Team Building (0 Portals)
1-1 Doors 0
1-2 Buttons 0
1-3 Lasers 0
1-4 Rat Maze 0
1-5 Laser Crusher 0
1-6 Behind The Scenes 0

Mass and Velocity (9 Portals)
2-1 Flings 4
2-2 Infinifling 0
2-3 Team Retrieval 0
2-4 Vertical Flings 0
2-5 Catapults 3
2-6 Multifling 2
2-7 Fling Crushers 0
2-8 Industrial Fan 0

Hard Light (10 Portals)
3-1 Cooperative Bridges 2
3-2 Bridge Swap 2
3-3 Fling Block 0
3-4 Catapult Block 4
3-5 Bridge Fling 2
3-6 Turret Walls 0
3-7 Turret Assassin 0
3-8 Bridge Testing 0

Excursion Funnels (0 Portals)
4-1 Cooperative Funnels 0
4-2 Funnel Drill 0
4-3 Funnel Catch 0
4-4 Funnel Laser 0
4-5 Cooperative Polarity 0
4-6 Funnel Hop 0
4-7 Advanced Polarity 0
4-8 Funnel Maze 0
4-9 Turret Warehouse 0

Mobility Gels (4 Portals)
5-1 Repulsion Jumps 0
5-2 Double Bounce 0
5-3 Bridge Repulsion 2
5-4 Wall Repulsion 2
5-5 Propulsion Crushers 0
5-6 Turret Ninja 0
5-7 Propulsion Retrieval 0
5-8 Vault Entrance 0

Art Therapy (2 Portals)
6-1 Separation 0
6-2 Triple Axis 0
6-3 Catapult Catch 0
6-4 Bridge Gels 2
6-5 Maintenance 0
6-6 Bridge Catch 0
6-7 Double Lift 0
6-8 Gel Maze 0
6-9 Crazier Box 0


The Courtesy Call (3 Portals)
1-1 Container Ride 0
1-2 Portal Carousel 0
1-3 Portal Gun 0
1-4 Smooth Jazz 0
1-5 Cube Momentum 1
1-6 Future Starter 2
1-7 Secret Panel 0
1-8 Wakeup 0
1-9 Incinerator 0

The Cold Boot (4 Portals)
2-1 Laser Intro 0
2-2 Laser Stairs 0
2-3 Dual Lasers 2
2-4 Laser Over Goo 0
2-5 Catapult Intro 0
2-6 Trust Fling 2
2-7 Pit Flings 0
2-8 Fizzler Intro 0

The Return (6 Portals)
3-1 Ceiling Catapult 2
3-2 Ricochet 0
3-3 Bridge Intro 2
3-4 Bridge The Gap 2
3-5 Turret Intro 0
3-6 Laser Relays 0
3-7 Turret Blocker 0
3-8 Laser vs Turret 0
3-9 Pull The Rug 0

The Surprise (4 Portals)
4-1 Column Blocker 2
4-2 Laser Chaining 0
4-3 Triple Laser 0
4-4 Jail Break 2
4-5 Escape 0

The Escape (14 Portals)
5-1 Turret Factory 6
5-2 Turret Sabotage 4
5-3 Neurotoxin Sabotage 2
5-4 Core 2

The Fall (16 Portals)
6-1 Underground 2
6-2 Cave Johnson 4
6-3 Repulsion Intro 0
6-4 Bomb Flings 3
6-5 Crazy Box 2
6-6 PotatOS 5

The Reunion (17 Portals)
7-1 Propulsion Intro 2
7-2 Propulsion Flings 2
7-3 Conversion Intro 9
7-4 Three Gels 4

The Itch (8 Portals)
8-1 Test 2
8-2 Funnel Intro 0
8-3 Ceiling Button 0
8-4 Wall Button 0
8-5 Polarity 0
8-6 Funnel Catch 2
8-7 Stop The Box 0
8-8 Laser Catapult 0
8-9 Laser Platform 4
8-10 Propulsion Catch 0
8-11 Repulsion Polarity 0

The Part Where He Kills You (14 Portals)
9-1 Finale 1 0
9-2 Finale 2 2
9-3 Finale 3 6
9-4 Finale 4 6