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Super Mario World
In Super Mario World, they are used to help Mario and Luigi to cross the lava river. They are only seen in a couple levels where there are levels filled with lava rivers. However, sometimes, Blarggs will jump out and try to attack Mario or Luigi, so they had to jump to avoid them, then land back on the Skull Raft.
Super Mario World television series
In the Super Mario World television series, a Skull Raft appeared in the episode, "Mama Luigi". Here, it shows that the Skull Raft is made of both wood and skulls, not just skulls like in the video game. During Luigi's story, Luigi got attacked by a Fire Sumo and fell into the Lava Pits. However, he landed on a Skull Raft, which saved his life. Unfortunately, he was heading for a lava waterfall, and Luigi and the Skull Raft fell down the waterfall, with Luigi landing on solid ground, where he found Baby Yoshi.
Super Mario Maker
Skull Raft reappears in Super Mario Maker. This appearance is different than in Super Mario World. They are able to move in air on top of moving in lava. They can be used in all four styles, featuring new sprites for Super Mario Bros. and Super Mario Bros. 3, and a 2.5D model for New Super Mario Bros. U. A blue variant also exists, that will not fall out of the map after a couple seconds. This blue raft is generally used to follow line guides.
Names in other languages