Na Escuridão (In the Darkness) is a system-neutral one-page adventure for role-playing games (RPGs), based on the classic “three-act scenario” model and designed to allow some versatility, depending on how much the Game Master (GM) wants to simplify it. If they wish to use only the most basic content available here, this adventure may last only for either a short one-shot or a couple-sessions mini-adventure, at most. If they wish to make use of the extra tips and options (and, perhaps, even complement with extra content of their own), this can easily turn into a small campaign.
The Player Characters (PCs) are in the subway, on their way to another absolutely banal day, until a series of surreal events trigger a fantastic adventure.
The name of the adventure is purposely ambiguous, so as to leave the adventure theme a mystery, as there are certain elements of the adventure that should only be known to the Game Master, in order to surprise the players.
In the Darkness also has 40 dialogue cards to help any player whose character dies during the game and becomes a ghost. That way, if they don't know what to say and how to stay relevant to the adventure now that they're dead, they can always draw inspiration from the cards.
Source: The Game Website.