A bronze, silver, or gold trophy is contingent upon the difficulty of the accomplishment, with each reward contributing to a level system attached to a player's profile. A platinum trophy is awarded to the player once they unlock all other trophies in the base game; smaller sized games, however, generally do not offer a platinum trophy. In addition, each trophy is graded by popularity—common, rare, very rare, and ultra rare—based on the percentage of people who have unlocked it.