International Karate +, stylized as IK+, is a fighting game written by Archer Maclean and published in 1987 by System 3 for the Commodore 64, Amstrad CPC, and ZX Spectrum.

The packaging illustration for the Activision Commodore 64 release version of IK+, entitled "Chop 'N Drop", was created by Marc Ericksen.

[1] The bitmap editor NeoChrome was used to draw background graphics and sprites[1] and the code was written in assembly language on an IBM PC-based development system that cross-compiled the 800 KB of source code in seven seconds and transferred the program to the RAM of the Atari ST via a parallel cable.

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

In 2003, Maclean's Ignition Entertainment released IK+ for the Game Boy Advance and PlayStation in Europe, which remained faithful to the 16-bit iterations.