Minimus: Roleplaying Distilled to its Essence (2008)

What Is Minimus?
Minimus is a game of interactive storytelling(sometimes called a roleplaying game) that relies on a player known as a game master to
adjudicate some disputes, and players, who take on fictional personalities called characters. All the rules for making characters are on this page; all the rules for playing the game are on the next page.
The game master, with input from the players, sets the theme of the game (star spanning traders, Vikings, the fall of Rome...nearly anything can be a theme). The game master uses the goals and relationships of characters to structure sequences of events called plots.
Minimus rewards describing actions, both successes and failures, and incorporating details into your description. Minimus uses a deck of playing cards for task sequencing, and 20 sided dice (called d20s).

Minimus Core rules are only two pages long.