GOO

GOO ( or Ghostly Organofluid Outflow) is the limited time currency available during the Treehouse of Horror XXIV Event. It is accumulated in order to win unique prizes. It is also accumulated in the Community prizes, where all players of The Simpsons: Tapped Out have their GOO counted together. When the Community GOO balance is high enough, unique prizes will be won. The highest prize is the King Homer's Tower, as 5 billion GOO must be collected across all players.

How to get Goo
GOO can be acquired in a number of ways. It can be collected by:
 * 1) Tapping ghosts and ghost characters
 * 2) Sending some characters on limited jobs which collect GOO for income (Marge, Homer, Bart, Lisa, Martin, Milhouse, Nelson, Mr Burns)
 * 3) Visit a neighbor and you can tap 5 ghosts per neighbor
 * 4) Visit a neighbor and you can haunt 3 buildings (after you have completed The Ghost In The Machine - part 3 - starting when Ned says, "Homer, I hate to be a specter hector, but your ghosts are all over the Flanders homestead.") You will receive at least 2 Goo per building haunted.  There is a tiny possibility of receiving 1 free Donut when you haunt.
 * 5) Tap on your haunted buildings in your town (you will receive at least 2 Goo per haunted building).
 * 6) Killing gremlins.

Trivia

 * According to in-game dialogue, GOO stands for 'Ghostly Organofluid Outflow.'

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