Challenge missions are optional difficult events in the Gravity Rush series all around the cities of Hekseville and Jirga Para Lhao, with a handful in other locations. They are accessed by interacting with designated spots in a challenge's given city. There are three types of medals that can be earned: Bronze, Silver, and Gold.
Rewards
Completing them and obtaining any medal grants you a certain amount of Precious Gems — the higher you score, the more gems you'll earn. Gems earned are cumulative based on the medal earned, though it should also be noted that the rewards can only be earned once.
Locations
Gravity Rush
Main article: Challenge Missions (Gravity Rush)
Challenge missions in Gravity Rush can be unlocked by paying Precious Gems when they become available, with the exception of the DLC missions.
Gravity Rush 2
Main article: Challenge Missions (Gravity Rush 2)
A new feature of Challenge Missions in Gravity Rush 2 is that Talismans are included as a one-time prize for obtaining a gold medal. Before the online servers were shut down, it was previously also possible to share times to a leaderboard featuring other players' times, as well as using them to obtain Dusty Tokens.