International Karate Plus. A classic of the genre. Long before Chun Li and co took tho the screens, this was the classic fighting game.
Introducing three contestants, up to two of which could be controlled by you or a friend, IK+ raised the bar with its varied locations which are beautifully realised and interestingly animated.
If the action gets a little to much for you, just take a rest and wait for the characters to start gesturing for your attention, eventually resorting to dropping their trousers in a bid to get you back into the game.