Boomerang Bros are NEW and powerful Bro Items in Mario & Luigi: Rivals in Adventure. These new bro items work just like Hammer Bros, except these items also attack the enemy from behind. Once Mario or Luigi take out the item, he will throw the item in the air, suddenly the brothers will be wearing Boomerang Bro. outfits. Then they must throw boomerangs at the opponent depending on who's glowing. Once all the boomerangs have been thrown they will hit the enemy and hit them again from behind, causing massive damage.