Portal Test Chamber 17

This Test Chamber is the eighteenth level of the game, and introduces the player to the Weighted Companion Cube. The Chamber also features multiple High Energy Pellets. This level can be skipped by using a technique called "Portal bumping" and the level is a home to the second Rattmann den where you can find a username and password which you can use to access the Aperture Science website back before 2010.

Hazards

 * High Energy Pellets
 * Cube Hazard