Number ruins

The Seven Ruins are ruins where the "Legendary Number" cards are located protected by guardians across the world in the Yu-Gi-Oh! ZEXAL anime. Each ruins consist of deadly traps and inscribe a legend on its wall telling the story of the person who occupied that location in a previous era, before they became ruins due to the ravages of time.

First Ruin
The First Ruin is where one of the "Legendary Number" a sleeps. Yuma and co. travel to this temple and challenged Mach who is guarding the sealed Number.