Region-free. Will work on UK/EUR/US consoles.
"M.U.S.H.A. is a 1990 vertically scrolling shoot'em up game in the Aleste series developed by Compile for the Sega Genesis. The player takes on the role of a flying mecha pilot who must destroy a large super intelligent computer threatening human life and planet Earth. M.U.S.H.A. has been praised by critics for its challenging gameplay, strong soundtrack, and graphics considered ahead of its time. In retrospective reviews, it remains among the most highly regarded shoot 'em ups on the Genesis and among the best of the 16-bit era."