Can You Play Original Xbox Games on Xbox 360? Only Select Titles (461/990)
Only ~461 of ~990 original Xbox games work on Xbox 360. Backward compatibility was limited, discontinued, and region-specific.
The Supported List
Major hits: Halo: Combat Evolved, Halo 2, Fable, KOTOR I & II, Ninja Gaiden Black, Psychonauts, Jade Empire, Star Wars Battlefront II, Max Payne 1 & 2, Splinter Cell trilogy.