Las Pruebas de Unter (Trilogía de Unter, 1)

Unter is a 42-level underground city controlled by an all-seeing system. If anyone wants to reach the surface, reserved for the elite, they must survive The Trials, a live-televised tournament that ends with only one survivor. Nova Black, a member of the rebellion, infiltrates the tournament to sabotage it, but when Adrien Solterra, the youngest winner in The Trials' history, becomes her coach, survival will be far more than they face.