Whether Space Mountain is scarier than the Incredicoaster depends on your specific high-fidelity triggers—darkness versus intensity. The Incredicoaster at Disney California Adventure is objectively more "High-Fidelity" in terms of physical thrills; it features a high-speed launch (0 to 55 mph in 4 seconds), a vertical loop, and multiple significant drops, all while running smoothly on a steel track. In contrast, Space Mountain’s fear factor is psychological. It is an "indoor" coaster that operates in near-total darkness, which masks the track and makes the relatively low top speed (about 28 mph) and sharp "wild mouse" style turns feel much faster and more unpredictable. While the Incredicoaster provides a more aggressive "High-Fidelity" physical rush with its inversions and height, Space Mountain often leaves riders more disoriented because they cannot anticipate the next move. Most enthusiasts in 2026 consider the Incredicoaster more "thrilling" but find Space Mountain to be more "intense" for those who are sensitive to sensory deprivation and tight, jerky maneuvers.