A new testing course has arrived just in time for the holiday season! Can you make it through the five festive tests GLaDOS has in store for you? ~We strongly recommended playing this map in high shader detail, as certain custom textures will not look as g...

Don't Start Here! Play Part 1 first. Part 1: http://steamproxy.net/sharedfiles/filedetails/?id=68627704 Part 3: http://steamproxy.net/sharedfiles/filedetails/?id=68651787 Or get the collection above. Major Spoilers Below! If you get stuck QubaHQ ha...

This is a new map which contain puzzles without Portalgun. They have become more difficult, smarter and harder. Puzzles are based on using the Repulsion Gel. And remember: you cant use Portalgun. You should push the buttons to open portals. So, good luck a...

Hammer Adventure First Version -- Medium Difficulty -- 15-20 min - Autosave =============== Story =============== Place : Aperture Center Year : Unknow Try to escape this place and find a way to the surface ! =============== The Trophies Quest ============...

Medium/Hard Difficulty Continue testing in the ruins of Aperture Laboratories Playthrough by Dexter Knight ...

Moving things where you want them is not always straightforward... This is the second instalment in the Sendificate series. Like the first part, difficulty is medium/hard; no ninja-skills required. It is strongly recommended to play the Sendificate maps in...

(Try my other levels, they're really lonely) Shameless Self-Promotion. Which has become quite popular overnight... Also, there's a walkthrough that some guy did: http://www.youtube.com/watch?v=fiFMcRc3UG8&list=UUKPAvI3r5oLSuiiFqRmGo4g&index=1&feature=plcp ...

A remake of my map for Portal 1 by the same name. Get it here: https://forums.thinking.withportals.com/downloads.php?view=detail&df_id=286 This map is very hard. Use F6 to quicksave and F7 to quickload....

3 x 3 x 3 Challenge...

Very Hard Difficulty The malfunctioning lift is taking you deep into the dark ruins of Aperture Laboratories... Playthrough by Selyp ...

Uprising is a two chamber map of medium difficulty in a Spacey-clean theme. A walkthrough is available for anyone having trouble completing the level. It is the intended solution. --------------- More details: Current version: 1.1 Theme: Spacey-Clean (Cust...

This map was to investigate whether I could make a good Wheatley styled map. Results were highly informative: I could not. Good luck. Difficulty: Medium About 10-15 minutes I finally learnt how to use env_projectedtexture! :D...