12 Days of Metal Gear

The 12 Days of Metal Gear was a viral marketing promotional event on the official Metal Gear Solid Facebook page, created for the leadup to the release of the Steam version of Metal Gear Solid V: Ground Zeroes. Named after the Christmas carol The Twelve Days of Christmas, the event focuses on events the player can do in Ground Zeroes set to the tune of the lyrics of the song.

Events

 * 12 Guards a Sleeping (referencing the lyric "12 Drummers Drumming" as well as the fact that the player can knock out soldiers)
 * 11 Snatchers Hiding (referencing the lyric "11 Pipers Piping" as well as the events of the Jamais Vu mission)
 * 10 iDroid Waypoints Set (referencing the lyric "10 Lords a-leaping" as well as one of the functions of the iDroid)
 * 9 XOF Badges Found (referencing the lyric "9 Ladies Dancing" as well as one of the sidequests in the main mission)
 * 8 Hind D Helicopters (referencing the lyric "8 Maids-a-Milking" as well as the extraction method in the main mission and most side missions)
 * 7 Missions Total (referencing the lyric "7 Swans-a-Swimming" as well as the total amount of missions in the game as of May 1 [the main mission, the four side missions, plus the two system-exclusive extra op missions])