This is a medium difficulty map made exclusively in hammer. We made a hard mode version as well, so if you think this was too easy or you're up for a challenge, try out the hard mode. Nocturnal Testing - Hard Mode Neither version requires any ninja or chea...

This is a Hammer map. 3 Test chambers in it, i hope you like it have fun all UPDATE: Fixed: in chamber 3 the water killed cube if beam wasnt activated, water was leaking. Unsure if Fixed: also the ball dropper i did a few minor edits, but i dont know if th...

Solve two co-op chambers with each player having control over one portal. Link to Part 2: Click here Link to Part 3: Click here ~Difficulty: Medium ~Estimated Time: 10-15 minutes When the orange player looks through the linked portals, a glitch can occur i...

Be sure to make use of the 'tab' function in which you can see what your partner sees. Keep in mind in cooperative chambers you must employ two sets of portals. Teamwork and communication is key to completing any cooperative test chamber. Big thanks to iWo...

Hello Test Subjects, It Appears it is that time again to release another hidden map we found while doing cleaning work in the deep parts of Aperture. This newly discovered area is different from previous areas, it has various puzzles that are in the easy -...

You back-up models have been cordially invited to the Aperture Science Moon Base! The caretaker is a little on the loony side, but we're sure you'll get along swimingly! Good luck with those tests! For Info On Ian B.'s new project Just Click The Link: Feve...

Year 2037: A hacker has infiltrated the Aperture Science Orbital Station and sabotaged the central system. You can no longer reach the observatory and the system that controls the central shuttle has been disabled for security reasons. No human being can i...

Can you control the ball through the maze, to the other size?...

The Deep Underground (Co-Op) Hello test subjects! Today you can start your testing in our mostly recently re-discovered test track. It's been a while since we sent test subjects here but we're sure it still works just fine! This map features 3 different ro...

A small chamber in which you'll need to share the test elements with your coop partner to complete the test. Difficulty: easy to medium. #twp...

'Bridge Building' created by DrFauli - 3 large rooms; difficulty increases with each room - design based on chapter 3 of the coop-campaign : Q: Does the solution to one of the puzzles include 'fast reflexes', dying or ninja skills? A: No! You don't need ni...

Hello All Once Again, <UPDATED: 21/11/2012 -- Fixed The Title Message will now show up on the screen (EDITED 28/11/2012) sorry the title screen still not showing, i thought i fixed it, i didnt check to see when i did think i fixed it lol i been really busy...