There is no official "portable" version of Need for Speed: Underground 2
Mobile (BREW/Java): An official 2D/3D mobile adaptation was developed for early mobile platforms like Qualcomm's BREW, though it was discontinued in 2012. How to Play the PC Version Portably
Monetization and distribution considerations
Modern Fixes: If your version doesn't have it, look for the NFS Underground 2 Widescreen Fix to prevent the image from looking stretched on modern monitors. Official vs. Fan Versions
