Splitgate is a fast-paced FPS game that utilizes a unique portal mechanic. But Splitgate has multiple game modes, and one of them doesn't even involve guns. These are called races and can typically be selected as weekly or daily challenges.
So you may be wondering what the Pantheon Race is. This is a race on the standard map Pantheon; there are no races on simulation maps. This requires you to navigate the map collecting disco balls, and using portals is the optimal way to achieve a record time. You can see a silhouette of the disco ball where the next one will be.
Related: What is the Abyss Race in Spligate?
With the weekly reset, the Pantheon Race is a weekly challenge. To complete this, you will have to finish a game of race on Pantheon. To do so, click the Play button in the bottom left-hand corner of the main menu. From here, you will have to select the Race game type.
This will take you to the race menu. Simply use the arrows in the bottom left-hand corner to navigate to Pantheon. Here you will see all the high scores for the map. You do not have to achieve a high score to complete the race or the challenge. Simply finishing the race will earn you the challenge.
For more information on Splitgate, check out How to fix Splitgate Unable to Authenticate error and What is a Portal Kill in Splitgate – How to get one on Pro Game Guides.