IK+

Three karateka fight against each other on a beach, trying to be the first to score six points. After every two rounds, there is a bonus game which is either deflecting bouncing balls or kicking away bombs. The C64 version of the game only has the ball bouncing bonus game, and not the bomb bonus game. The game can be played by one or two human players; at least one fighter is always controlled by the computer.

Unlike its predecessor, International Karate, there is only one backdrop, but different parts of the backdrop can be recoloured to several different themes by the players using specific keystrokes. The Amiga, Atari and C64 versions of the game (and possibly other versions, unconfirmed) had a number of "background antics", a Pac-Man would appear, a spider would descend, and a U-boat's periscope would occasionally be seen in the harbour. In addition, pressing a certain key or keys would cause the trousers of all three protagonists to fall down, after which they would do a double-take. Additionally, it was possible (on the Amiga version, at least) to type in four-letter curse words; the game would respond first by rebuking the player for their use of such language, and upon the second offence would reset the game.

The original release of the game was well received by critics. It was voted Best 16-Bit Soundtrack of the Year at the 1988 Golden Joystick Awards.

The later Game Boy Advance port, however, received negative reviews. Advance, criticized the "thinness of the gameplay" and stating that "there are simply too few moves available". The reviewer noted that while nostalgic memories of the original Commodore 64 version might be positive, the port failed to compete with contemporary fighting games. Jim McCauley of GamesMaster gave the port a lower score of 43%. Nintendo Power criticized awkward controls and choppy animation.

Another International Karate Deluxe game (AKA IK++) was ready but unreleased for the Atari ST and Amiga in 1987/1988.