Shell dash

A Shell Dash is a move which Mario and Luigi can perform in New Super Mario Bros. They can only do it if they are Shell Mario or Shell Luigi. It involves dashing with a Blue Shell on them. They then duck into their shell and spin around like a Koopa Troopa when it has been kicked. In this form they can also break bricks and defeat enemies, but unfortunately Mario and Luigi only got 200 points for each enemy in a chain, but if they had kicked an actual Koopa, they would get increasing points until they got extra lives.