From publisher blurb:
In 90 Days to Survive, you will take on the role of characters (called “Survivors” in Outbreak: Undead) and play in a series of game sessions as you and your companions fight to survive in an apocalyptic setting. Your choices will not only affect your Survivor and the play group that you are roleplaying within but also the shared world at large.
The actions of each play group will be documented and shared over the course of the campaign. This data will be organized by the game runners and the changes in the setting will be shared with all players in a communal forum to be incorporated into the sessions run by the individual Game Masters. (In 90 Days to Survive, updates will be made over a special Discord channel). These actions encompass anything that a player has their Survivor do in order to make it to the end of the 90 day campaign period.