This is one of those “musical games” where the sound produced by the computer isn’t music at all. This so called game is a collection of more than 50 one-liners: a couple of instructions/info blocks and 50 levels in 50 BASIC one-liner separate loads. The concept is pretty simple and straightforward: press the correct key when the labeled square containing which hits the top-most flickering lines. Like an upside-down Guitar Hero (scrolling from bottom to top using Sinclair BASIC is easy, but doing the opposite is not), but you use the keyboard instead of a guitar. And you listen to random bleeps instead your Metallica favourite number. But the achievement is the game itself: I wonder how this guy got the nerve to produce 50 levels without getting bored. Great, great achievement, to be honest!
Urm… Good luck.