Ninja Warrior refers here to American Ninja Warrior, a competition series in which athletes NBC calls Ninjas race obstacle courses for a $250,000 grand prize, airing on NBC since its fourth season.
According to NBC, the first episode aired on G4 on December 12, 2009. The first three seasons were filmed in Japan as a gateway for American competitors to compete on Sasuke, the Japanese series NBC describes as "the precursor to the modern ninja obstacle course race." The show began airing on NBC with Season 4 and still airs on the network.
NBC's guide to Season 18 describes a competition now fully based in 📝Las Vegas, with the course set up just off Las Vegas Boulevard. Ninjas from the West, Central and East regions face off in Regional Qualifiers of 80 competitors each, and those who scale the Warped Wall within the time limit earn a shot at the 18-foot Mega Wall and its $10,000 prize. NBC's guide also describes "The Tripleheader," a three-lane race in which only the top two Ninjas of each race move on to the National Finals.
The National Finals follow an all-racing format. Sixty athletes are split into 15 groups of four, the top 32 advance to a single-elimination Finals Tournament, and the final two race an eight-obstacle course to decide the Last Ninja Standing, who takes home the grand prize.