Leaderboard Crowns were a feature added to Perfect Dark when it was released on the Xbox Live Arcade. Similar to Xbox Live's achievements, Crowns are unlocked by performing certain feats in-game, mostly during Solo Missions. Some crowns can be earned in Co-operative mode, but not all can. When a crown is unlocked, the player is notified. After earning a crown, it will appear on the online leaderboards next to the player's clear time for its respective mission. There is a crown for every mission, and there are others that unlock Xbox Live avatar awards, gamer pictures, and dashboard themes.