White Block

White Blocks, also referred to as Ice Blocks  or blue blocks, are a type of icy Block that appear in Super Mario Bros. 3 and its remake, Super Mario Advance 4: Super Mario Bros. 3. They resemble white or light blue Brick Blocks and appear alongside another type of Ice Block predominantly in Ice Land. Unlike the other Ice Block, the White Block is not slippery when walking over it, and instead, players are able to pick it up and carry it with them. When doing so, they can only hold it for a short time before it disappears. When thrown, it can defeat multiple enemies, like a Koopa Shell, though it breaks upon hitting a wall. White Blocks can also be picked up by a Buster Beetle, which will throw it at high speeds towards Mario or Luigi if it gets its hands on one of these blocks.

In Super Mario Advance 4: Super Mario Bros. 3, kicked White Blocks can bounce back from flippers and damage the player.

A similar type of block known as the Grab Block appears in Super Mario World. While these resemble dark blue Rotating Blocks, they can be picked up, carried and thrown by players as well.