NRG-500 Challenge is a side mission in Grand Theft Auto: San Andreas. The mission is started by entering a parked NRG-500 at a dry dock in Easter Basin, San Fierro. The goal is to collect 18 floating coronas around the dry dock before the countdown timer runs out of time. The countdown timer starts at 10 seconds when the cutscene ends. Each corona will add 10 seconds to the timer. The reward for completing this mission is $1,000 and a step closer to 100%.