4.32 Half-Life 2: Episode Two (2007)
4.19 Portal (2007)
4.17 Left 4 Dead (2008)
4.08 Half-Life 2: Episode One (2006)
4.02 The Orange Box (2007)
3.93 Half-Life 2 (2004)
3.91 Counter-Strike: Source (2004)
3.55 Quake II Mission Pack: The Reckoning (1998)
3.51 Half-Life: Blue Shift (2001)
3.34 Half-Life (2001)
3.31 Kingpin: Life of Crime (1999)
3.22 Redneck Rampage Rides Again (1998)

^*Games must have at least 5 votes to be included.