Spraypainting
Survivors have the ability to spraypaint the walls of any block (Note: Billboards cost 10 AP instead of the usual 1 AP), leaving a message readable by any character standing in the same place. Every type of block has suitable surfaces available - buildings can also be graffiti'd on the inside. The graffiti will appear as Somebody has spraypainted ... onto a wall, where ... is replaced by whatever text you enter; up to 50 characters.
In order to spraypaint, a player must be carrying a Spray Can. A spray can lasts for a random number of uses.
Painting over an existing message will overwrite that message with the new one. It is possible to improve the appearance of an existing message by spraying the identical words repeatedly; however, there is no known in-game benefit to doing so.
The Tagging skill gives experience for spraypainting certain types of blocks or buildings, and makes spray cans last longer.
There is also a Great Graffiti hall of fame where amusing, famous or otherwise memorable Graffiti is immortalized.
