Tile movement

When you match three they shoot.

When you match 4 they shoot and it leaves a bomb/dragon.

When you match 5 they shoot and it leaves a diamond.

What if …

When you match six the whole screen full (all) of tiles shoot?

Diamond is the best you can get. I’ve occasionally managed a screenwide line during a cascade. You can get a diamond from some downright weird shapes though, if there happen to be contiguous tiles of the same color all together.