Patches

Patches are updates to the game that fix known bugs, glitches, or exploits within the game, and often add new features or balance changes to items, levels, or other game elements.

Although each patch is usually paired with notes detailing what has been altered, some alterations are not mentioned. These undocumented changes rely on the community to notice their existance and therefore report them to others. As such, the exact date of undocumented change implementation will be an estimate.

2018

 * March 28
 * January 2

2016

 * December 7
 * October 20
 * July 5
 * July 1
 * June 7
 * June 6
 * April 28

Full list of Portal 2 patches
{{Columns-list|2|

2018

 * October 31
 * June 20
 * June 05
 * May 21
 * March 05

2017

 * November 30
 * September 08
 * July 28
 * July 27
 * June 30
 * January 24

2015

 * October 10

2014

 * December 04
 * June 17

2013

 * June 6
 * March 21

2012

 * November 26
 * November 21
 * November 20
 * September 18
 * August 29
 * August 18
 * August 16
 * June 04
 * May 21
 * May 10
 * May 09
 * May 08

2011
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 * October 24
 * October 11
 * October 7
 * October 4
 * September 12
 * August 30
 * July 7
 * July 1
 * May 26
 * May 20
 * May 12
 * May 10
 * May 6
 * April 29
 * April 22
 * April 21
 * April 19

2012

 * May 21
 * May 10
 * May 09
 * May 08

2011

 * October 24
 * October 11
 * October 4
 * May 26
 * May 20
 * May 17
 * May 12

Full list of Portal patches
{{Columns-list|2|

2014

 * December 8

2013

 * June 24

2012

 * November 30

2011

 * March 2

2010

 * November 12
 * August 17
 * July 21
 * June 15
 * June 3
 * May 27
 * May 25
 * May 15
 * May 13
 * March 3
 * March 1 (ARG)

2009

 * June 23
 * February 20
 * February 17

2008

 * June 10
 * January 26

2007
}}
 * November 27
 * October 30

2005

 * April 19
 * April 5
 * February 22
 * February 1