Coral

Coral is a minor obstacle found in Super Mario Bros., where it is found in World 2-2 and World 7-2. It can not harm the player, though it acts as a barrier that Mario must swim around. Coral is pink and acts similar to Hard Blocks. 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, but serves the same purpose as it did in Super Mario Bros.. In Super Mario Bros. 3, it resembles a large stack of rings, though large versions of Super Mario Bros.-like coral can be found in World 4-4. After making common appearances as a simple background element in many games, coral as an obstacle returns in Paper Mario: The Thousand-Year Door, where it is found in an underwater level and can be destroyed by Bowser's Fire Breath.

Coral appears in the Super Mario Bros. and Super Mario Bros. 3 styles in Super Mario Maker. Coral is created by placing ground blocks in a stack in the underwater theme.