Region-free. Will work on UK/EUR/US consoles.
This is Mortal Kombat II, with the following cool added extras:
Added a combo system;
Secret fighters now fully playable;
Bosses now fully playable;
More new sounds;
New stages and music from Mortal Kombat 1;
New moves such as Brutality;
New Game Modes such as Practice and Endurance;
Returned biographies/Endings/Intro/VS-screens from the arcade version