From the Game's Introduction:
Sunrise is a role-playing game. In roleplaying games, the players control fictional characters, and describe how their characters react to a fictional setting provided by the Game Master (GM). Some role-playing games are completely freeform, and others are acted out. However, many games (including Sunrise) are played around the table, and the success or failure of a character's actions is determined by the roll of the dice or some other random method.
Characters have three main attributes: Brawn, Reflexes, Mind.
Randomisation for this game is done using (six-sided) dice, rolling a number equal to one greater than the difference between the difficulty and the character's action value (if the action value exceeds the difficulty, success is automatic). The task fails if any dice roll odd numbers.