Assist Block

Assist Blocks are golden blocks that appear in the Nintendo 3DS game Super Mario 3D Land. There are two types of Assist Blocks: one that contains an Invincibility Leaf, and one that contains a P-Wing, each shown with an icon of their respective power-ups. Each block is meant to contain these power-ups which assist the player to reach the end, and they appear near the beginning of the stage after losing a certain number of lives in that stage.

The Invincibility Leaf Assist Block only appears after Mario loses five lives in a single stage. Once Mario collects the Invincibility Leaf, he transforms into White Tanooki Mario and becomes invincible for the entire stage.

The P-Wing Assist Block appears after Mario loses ten lives in a stage. Using the P-Wing takes Mario all the way to the end of the stage, in front of the Flagpole.

Assist Blocks don't appear in the Special Worlds.

It should be noted, however, that if any of the Assist Blocks appear in a stage, the player will unable to have glittering stars on their save file (The same thing applies to the Super Guide Blocks from New Super Mario Bros. Wii).