Diáspora Zero

Diaspora Zero is a prequel story to Diaspora, but it stands alone.
In it, 1 to 24 players will attempt to solve the 24 cards that contain a unique code within them. Through email communication with the interstellar ship in which the three protagonists of the story are traveling, players will gradually unveil new puzzles and acquire fresh information about the game's storyline as they solve the cards.

—description from the publisher