May 10, 2012 Patch

{{Patch layout
 * source = http://store.steampowered.com/news/7947/
 * source-title = Portal 2 Update Released


 * before   = May 09, 2012 Patch
 * current  = May 10, 2012 Patch
 * after    = May 21, 2012 Patch


 * notes =

Portal 2
}}
 * Fixed issues causing bad lighting in some puzzles