I find this game very easy eventhou I don't really know how to play... Only need like 1-8 continues to beat all the opponents.
At first I play slowly trying to arrange the colors into big blocks, but that is a bad strategy and I lose most of the time doing that. But I found out that if you drop the block faster, and randomly is ok too, if you are dropping it fast enough on both sides and not in the middle part, that ur chances of winning will be higher.
Edit: To unlock the sounds and master arcade mode, you just beat the characters in Street Puzzle mode.