AVSEQ is weird. WEIRD. It is an audio-visual sequencer puzzle game. That much is obvious once you look at any screenshots of it. It is bright, it is nice, it is confusing. Yes, confusing. See, the aim of the game is to add the required number of notes using these steps:
1) to connect falling atoms of the same color
2) using the white atoms to bridge different colors together (optional but longer strings equals higher points and more chances of notes to appear)
3) detonate them before any of the atoms in the string touches the bottom (failing which the entire string goes *poof* and some notes disappear)
4) chain up notes when they appear (notes act like white atoms) and reach the target
The confusing part? The background is nice and all but sometimes you can't see a thing and speed is of the essence here. There is 9 different stages and when beat, every stage unlock an infinite mode. However if you are aiming for the note achievements, take note that playing infinite mode refreshes your note count. Also, the game doesn't track progress for achievements so you have to do it in one sitting.