I didn't mean to say it's a rip off. It's different enough, and plus it's cool. I'm just speculating that the Plink coders must know about it. I got to play with the Planck alpha, and Plink "feels" similar in certain ways. The way the notes are displayed as ripples, the way motion across the play area triggers notes on a scale with different instruments (which in Planck are "weapons"), and the way the notes are quantized. In Planck, the notes/loops happen when you hit something you're shooting at, but the point isn't so much to hit things as it is to create rhythmic loops between the gameplay and the music you're generating. It makes some interesting compromises to keep the music on tempo and still give the sense of hitting the targets instantly. Really, I just wanted to know if the Plink guys had heard of it.