Unused content

Much like any video game, the Portal series contains a large amount of content that was cut from development due to a series of reasons. Below is a list of items and other unique mechanics that were unfortunate enough to be put on the chopping block.

Mechanics
{| class="wikitable grid" width="100%" ! class="header" width="15%" | Name ! class="header" | Notes
 * Pneumatic Diversity Vent
 * This type of mechanic was first introduced in a demo of the same name, displaying its abilities to pull objects at a high force. This mechanic was cut from the game during the later stages for unknown reasons.
 * Sticky Gel
 * This mechanic was mentioned to allow players to stick to to wherever the gel was placed. It was cut from the game when play-testers complained of motion sickness.
 * Sticky Gel
 * This mechanic was mentioned to allow players to stick to to wherever the gel was placed. It was cut from the game when play-testers complained of motion sickness.