Located exactly in the middle of Central America, Numerun is known as the “newest old” city in the world. Its territory has been settled for over a millennium, but the city itself was rediscovered by settlers from across the ocean nearly five hundred years ago. The settlers shared goods from their side of the world with Numerun, attracting a competitive economy, the likes of which Numerun had never seen before. As a result, the city grew immensely in the next few hundred years, becoming one of the most diverse, economical, and intellectual cities in the world.

Through all of this, the ancient city center of Numerun has been preserved from modern urban development, making the city one of the most interesting tourist attractions in the world. One of the most notable landmarks is Colina Umerun, an artificially created hill designed specifically for marble racing. The hill was designed centuries ago for recreation, and, through frequent renovation, is still in use today. In fact, going down Colina Umerun is what inspired each of the Rojo Rollers—and Red Number 3—to enter the realm of marble sports.

The Rojo Rollers hail from the outskirts of Numerun and previously worked in the modern city center, which encircles Numerun Antigua. The five team members were all familiar with each other from the workplace, where they were mathematicians at competing universities. They formally met each other during the city’s Milenaria, which was celebrated in Numerun Antigua. The universities decided to go together in a historic academic event, grouping together departments of various schools on the trip. After getting to know each other throughout the day and making several bad math puns, the five marbles went down the Colina, one after the other, and regrouped at the bottom.

“I’ve always been a big fan of racing,” said Rojo Uno. “It may not look like it considering how academic I am, but it has always inspired me. But I never actually wanted to be a part of it until that day.”