Knockdown Karate, by nord Creations is a port of International Karate+ from the days of the Commodore 64.

The game is available in both a grayscale and color versions.
Your goal in Knockdown Karate is to advance through the different stages accumulating points and maturing from a white belt up through a black belt.
As the player you begin as a white belt fighter in Japan. Each stage has three fighters competing in a match against each other. The first fighter to record six points in each stage is the winner. In order to advance to the next stage you must finish either first or second. Advancing through two stages will cause the location to switch. You will also get to play the bonus game where you take your turn at the ancient Karate display of breaking a stack of bricks.