There's not much to it, but we like it. MusicNeon ($.99, available here) directs you to rotate neon tubes to create a connection from the positive electrodes on the left to the negative electrodes on the right. When a connection is made, the tubes all light and are then replaced with new tubes. As you advance, more tube styles are added. Each tube has its own sound, so you'll hear a musical riff as you make each connection. It's not a hard game, but it's just right for those times when you need a little mindless diversion.