White-Green Checkered Block
From the Super Mario Wiki
White-Green Checkered Blocks are blocks that make their appearances in New Super Mario Bros. Wii and Mario Party 9. As the name implies, it is a block that is checkered green and white. It is similar to the Jump Blocks from Super Mario Bros. 3 and Super Mario World; however, the checkered blocks don't drop items. Like the Jump Blocks, timing is needed to jump really high on the White-Green Checkered Blocks by pressing right when the player lands on the block. These checkered blocks are uncommon and can be found in stages such as World 7-5, Lakitu Enemy Courses, and in Iggy Koopa's castle.