A Traffic Light is a super piece that you can get by matching five pieces in a row. If you match it with any basic piece, the Traffic Light will destroy all pieces of the same color. You can also match a Traffic Light with a Firework or Dynamite of any color. If you do that, all pieces of the same color will be replaced with Fireworks or Dynamite respectively, and immediately activate. Note that Dynamite created this way will only explode once.