Rocket Engines are hazardous obstacles in New Super Mario Bros. Wii and Super Mario Galaxy. They are cannons who emit flames for a few seconds and stop for a while. Mario must use this time to avoid being damaged by their flames, as for touching the flames, makes Mario lose a form, die if small Mario, or lose a wedge of health. Rocket Engines are mounted on walls, ceilings, anywhere, making their flames emit in any direction. In New Super Mario Bros. Wii, they appear on World 4's Airship. Here, they can turn directions. In Super Mario Galaxy, four Rocket Engines appear on the Saucer Planet of the Good Egg Galaxy. Here, they act like Bill Blasters but they shoot out a small explosion. If Mario/Luigi is standing near the opening when it fires, he will get hurt.