International Karate + (aka IK+) was a karate fighting game produced by System 3, back in the 1987, for the three 8bit home-computers, Commodore 64, Amstrad CPC and Spectrum ZX. In 1988 it was converted for the Atari ST and Amiga (1 Disk 3.5").
Story: An excellent title, in which, 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 game can be played by one or two human players, at least one fighter is always controlled by the computer.
Gameplay: To be honest this is a tough game. It's easy in the first two-three rounds (each round is separated in two fighting events between the three fighters). When passing a fighting round a new karate belt is being given (I only managed to gain the fourth - purple - after playing 100 times or so back to 80s either on 8bits or16bits version!). Between the rounds there is always a bonus round, as previously mentioned.
Graphics/Sound: The CPC version looks good, having bright colors and smooth enough sprite animation. All Karatekas move nice having several frames of animation here. Backgrounds are cute too, although having a single scene (a sunset over the sea etc) with occasionally some animated happenings (birds flying, a Pac-Man would appear, a spider would descend etc)! Note that the game runs way smoother on the C64 version (sprites move faster and smoother) and backgrounds look closer to the 16bit version (Amiga, Atari ST)! Some details also are clipped on the CPC version such as the tree standing at the very right (and found on the C64 version! Soundwsie the game is great on the CPC offering a great tune during gameplay along with a few SFX. The sound is way better on the C64 though...
Some videos belong to retroshowcase.com (indicated); others not
CPU: ZiLOG Z80 4MHZ MEMORY: 64 KB or 128 KB of RAM depending on the model (capable of being expanded to 512k using memory extension boards) GRAPHICS: Motorola 6845 address generator, Mode 0: 160x200 / 16 colors, Mode 1: 320x200 / 4 colors, Mode 2: 640x200 / 2 colors, A colour palette of 27 colors was supported SOUND: The CPC used the General Instrument AY-3-8912 sound chip, providing 3 channels Mono Sound (via internal speaker) but capable to offer Stereo Sound provided through a 3.5 mm headphones jack (with pretty impressive outcome!). Also, it is possible to play back digital sound samples at a resolution of approximately 5bit. This technique is very processor-intensive though.