Message Block

Hint Blocks (originally called Face Blocks) are blocks that make faces. They appear in Super Mario Bros. Deluxe and are in Vs. Mode. The white, smiling ones are good, while the red, sticking-their-tounge-out-at-you ones make the level harder.

In Super Mario World 2: Yoshi's Island, Yoshi's Story, and Yoshi's Island DS, they're white and give tips when hit. They are very common in the first world. They are also called Hint Blocks in these games.

Hint Blocks also appear in Super Smash Bros. and Super Smash Bros. Melee in the Yoshi's Island level (unlockable in Melee). They just appear in the background and are not important.

Hint Blocks look significantly like Perry Blocks.