Snake Blocks are blocks in the Mario series that made their first appearance in Super Mario World. They appeared once again in New Super Mario Bros. and in Super Mario Galaxy 2 in the Boo Moon Galaxy, Bowser's Lava Lair, and Bowser's Galaxy Generator. They will usually appear in groups and when Mario (or Luigi) stands on them, they will start moving around as if they were a snake, transporting Mario and Luigi to different areas. Riding on them is a challenge, due to the fact that they go in unexpected directions and travel right threw obstacles. In Super Mario World, they resemble as Used Blocks, and in New Super Mario Bros., they are green, and in Super Mario Galaxy 2, they are purple. Also, there is a blue version of them known as the Ice Snake Blocks that appear in New Super Mario Bros. Wii.