Differences between Portal and Portal 2

This page is a list of all the differences or similarities between the games Portal and Portal 2. Should you find anything not listed here and of enough importance, do not hesitate to add it here. If a fact's deletion is deemed reasonable, it may be removed.

Due to the immense amount of data discovered during a playthrough of both games, this page is spoiler heavy.

Similarities

 * Both Portal and Portal 2 are set in the same area and in the same universe (along with Half-Life).
 * Both games feature a similar storyline -
 * Both games feature the same protagonist.
 * Most testing elements (such as the Weighted Storage and Companion Cubes, Sentry Turrets or Super Buttons) are the same in both games.
 * Most testing elements (such as the Weighted Storage and Companion Cubes, Sentry Turrets or Super Buttons) are the same in both games.
 * Most testing elements (such as the Weighted Storage and Companion Cubes, Sentry Turrets or Super Buttons) are the same in both games.

Differences

 * The maintenance areas were significantly revamped.
 * The maintenance areas were significantly revamped.


 * At many times while playing Portal, the player may see extended pistons that are used to move test chamber walls. In Portal 2, pistons are replaced with Multitasking Arms with the exception of Victory Lifts, which only had their model changed. However, pistons are still used, though very infrequently, and only in a level in Chapter 7.