Getting Started
Everything you need to know before your first test chamber. The portal gun, momentum conservation, Aperture Science, GLaDOS, and survival basics for Portal.
Puzzle Mechanics
Portal physics explained. Momentum conservation, fling techniques, every test element, turret behavior, Energy Pellet routing, and advanced movement tricks.
Test Chamber Walkthrough
Walkthrough for all 20 Portal test chambers, the escape sequence, and the GLaDOS boss fight. Spoiler-free progression tips and full puzzle solutions.
Advanced Maps and Challenges
Post-game content for Portal. All six advanced test chambers, challenge map medal targets for Least Portals, Least Steps, and Least Time, and strategies for gold medals.
00% Achievement Guide
All 15 Portal Steam achievements. Verified unlock conditions, global unlock rates, Camera Shy bug warning, Transmission Received radio coordinates, and the recommended completion order.
Lore and ARG History
The Portal ARG, hidden radio transmissions, SSTV decoded images, the Party Escort Bot retcon, Rat Man backstory, and the connection to Portal 2 and Half-Life.