You can select characters skinned to look like Ryu, Ken, Chun-Li, and Akuma.

The most famous and playable version is the by a modding group known as "The 2D Crew" or similar anonymous developers. It features pixel-art sprites, 2D backgrounds, and a simplified control scheme that captures the essence of SF4’s Focus Attacks and Ultra Combos.

These collections feature pixel-perfect arcade emulations of Street Fighter II Champion Edition Hyper Fighting PS1 Classics:

While a native does not exist, the passion of the fighting game community keeps the search alive through creative mods and homebrew projects. To avoid security risks, ignore sketchy download links promising the impossible. Instead, enjoy Capcom's amazing official PSP legacy or jump into the mobile and PC handheld versions of Street Fighter 4 .