The Challenge Series in Need for Speed: The Run features several separate categories of events with each series focusing on certain states, territories, terrains, vehicles, or themes. Different series are unlocked as the player progresses through each stage of The Run.
Rewards can be earned upon completion of an entire series with either bronze, silver, gold, and platinum medals.
Coastal Rush is a series of events and is unlocked upon the player completing Stage 1 of The Run.
K&N Challenge is a series of events and is unlocked upon the player completing Stage 3 of The Run.
AEM Challenge is a series of events and is unlocked by entering the cheat code - "aemintakes".
Old Spice is a series of events that could be unlocked as part of the Old Spice "Smell Faster" Pack promotion, but its availability was limited to only residents of the United States of America and Canada.