|Manufacturer||Rocky Mountain Construction|
|Type||Steel - Single rail - Twin|
Unknown is a steel single rail roller coaster being built by Rocky Mountain Construction at Walibi Holland in the Netherlands. The coaster will have two tracks: a more intense track with multiple inversions, and a more family-friendly track without inversions.
In February 2023, the coaster was announced as a dual coaster with an inverting side ad a non-inverting side. In the park's press announcement, they confirmed that the ride would be a dueling Raptor coaster built by RMC, the same company that had built Untamed in 2019.