The physics engine in Underworld is tied to the frame rate. If your FPS goes too high, Lara might fly off into space or puzzles will break.
While the "free" tag is tempting, 2008-era games often require specific that are pre-packaged in official digital versions but missing from sketchy cracked copies. Where to get it safely: Tomb Raider Underworld Free Download
If you run into launch issues, right-click the .exe , go to Properties, and set it to run in Windows 7 Compatibility Mode . The physics engine in Underworld is tied to the frame rate
If you're looking to play , your best bet for a "solid" experience—meaning one that actually works on modern PCs without crashing or installing malware—is to grab it through official digital storefronts. right-click the .exe