Coral

Coral from Super Mario Bros..

Coral is a minor obstacle found in Super Mario Bros.. In World 2-2 and World 7-2, coral proves to be a minor obstacle that can not harm the player. Coral is pink in color and acts similar to unbreakable bricks. The player can stand on the coral, but the enemies can swim through it. Coral also appears in Super Mario Bros. 3 in a few levels and Paper Mario: The Thousand-Year Door, where it is found in an underwater level and can be destroyed by Bowser's Fire Breath.