The size of the firecracker directly depends on the duration of the fireworks and its entertainment. The more, the grander. Therefore, in the FireStack game you will create the largest firecrackers and for this you just need to collide two identical units in order to end up with a new, larger one. Throw firecrackers into a special magical container, where the magical merger will take place. You just need to make sure that the space doesn't fill to the top too quickly in the FireStack.
