Mirima Tyalie is a concise role-playing system that presents a simple core mechanic and several optional rules. The intent is to allow the system to be highly flexible. For example, a psionics and a magic system are provided as options. However, these systems are not usable "out of the box" and would require expansion prior to campaign use. Characters are built using either random process or point pool purchasing.
The core mechanic involves characters rolling a dice pool of d10 based on Skills, and attempting to "roll under" the rating. The GM rolls a similar dice pool based on Difficulty, and the rolls are compared. Skills advance through use. Combat is handled the same way, though optional rules add armor, damage reduction, and various damage types.
The game was intended to be expanded with various genre-specific supplements.