If the player hits a block that is either the same color as the missile fired, that block and any other same-colored blocks adjacent to it will be destroyed. Differently-colored blocks will not be affected by shooting at them; however, if they are held solely by a group of blocks of the same color, they will fall into the water when that group disappears. Blocks with rainbows on them can count as any color. Unlike Puzzle Bobble , there are no walls in single-player mode. If the player aims the weapon outside of the screen, a heavy object might fall on the player-controlled boat, damaging it.