|Debut Appearance||Super Mario Bros.|
|Latest Appearance||Paper Mario: Sticker Star(2012)|
|Effect||Release an item when hit.|
The Question Block (or ? Block or Mystery Block or Prize Block) is one of the blocks that has appeared since the start of the Mario series. They are usually commonly seen floating in the air and contain Gold Coins, Super Mushrooms, or Fire Flowers. Some games contain invisible Item Blocks. In Super Mario Bros. 3. there are multiple ways to hit a block like using the Super Leaf, Tanooki Suit or the Cape Feather, as they will use their tails or cape to hit the block. Mario can also use a Koopa Shell to hit the Item Block and collect the item. In more recent games like New Super Mario Bros. Wii, a Ground Pound can be used to open the block.
There is a lot of mystery that surrounds the Question Blocks, and little is known about their origin. Super Mario Bros. would give an explanation that Bowser would use the Koopa Clan's famous dark magic to create a curse on the Mushroom Kingdom and turn its citizens into various objects, including blocks. The games manual would later explain that Mario could "come across Mushroom People who had been turned into bricks" and collect items from them.
 Super Mario Series
 Super Mario Bros.
Super Mario Bros. would be the Question Blocks first appearance in the Mario series. It will be seen flashing and will give Mario coins or items when he hits the block. They are very common in the game and sometimes are required to hit to finish a level or help in a dire situation. Some blocks are hidden and can only be seen when Mario hits them. Some will also release Beanstalks into the air for climbing.
 Super Mario Bros.: The Lost Levels
 Super Mario Bros. 3
They would get a different design in Super Mario Bros. 3. They no longer flash and the ? marks will move. They will still give Mario coins and other power-up items that will help Mario in his journey when he hits them.
 Super Mario World
Question Blocks would be called Prize Blocks in Super Mario World. They would have eyes and the animation of the Rotating Blocks. Nothing else has changed with the block as they serve the same purpose. This game would introduce the Flying Question Blocks that fly left to right while moving up and down. There would be a red Question Block in Bowser's Castle to activate the spotlight.
 Super Mario Land
They would serve the same purpose and functions as previous games in Super Mario Land.
 Super Mario 64 DS
They would appear in Super Mario 64 DS as they would replace the red, blue, and green ! Blocks with red Question Blocks. They can be activated by hitting the ? Switch. They will contain Power Flowers, Feathers or Bob-ombs.
 New Super Mario Bros.
They would appear in New Super Mario Bros.. Red flying Question Blocks can be seen flying around the world map as they move to different levels every time Mario or Luigi lose a life, complete a level or enter a Toad House. These blocks would contain one of the five items: Fire Flower, 1-Up Mushroom, Mini Mushroom, Mega Mushroom, or Blue Shell. Regular Flying Question Blocks would also appear but move left to right or won't move at all. In two of the Ghost Houses, some blocks will contain Boos. Beanstalks will sprout from some blocks when hit and rare red blocks will appear in World 6 with spikes on top. They will rotate one side at a time and Mario will need to be careful not to hit the spike side. If the player hits it quick enough, then a Mushroom will pop out.
This would be the first game where the Question Block can be hit by above from a Ground Pound.
 Super Mario Galaxy
Super Mario Galaxy would see the Question Blocks contain Star Bits and coins. They could sometimes be hit multiple times before the vanished. These blocks could not be Ground Pounded like in New Super Mario Bros.
 New Super Mario Bros. Wii
They would return in New Super Mario Bros. Wii, with the same functions as before. In some levels, they would tend to sway back and forth with other objects. While others will lay in water and can be easy to ground pound. Red Flying Question Blocks would not appear in the game.
 Super Mario Galaxy 2
Question Blocks would re-appear in Super Mario Galaxy 2. Like their appearance in Super Mario Galaxy, they will release Star Bits when they are hit. They can release one Star Bit at a time repeatedly until they vanish. The Flying Question Blocks would also appear and act the same way and will make chirping noises when they fly around.
 Super Mario 3D Land
Question Blocks appear in [[Super Mario 3D Land]. They can be activated by a Ground Pound and transformed into a Used Block. They will produce items like in past games, like the Super Leaf. This game would also introduce long Question Blocks and release different amount of Coins when they are hit.
 New Super Mario Bros. 2
Question Blocks would return in New Super Mario Bros. 2 with the same look as they were in Super Mario 3D Land. The rectangular Question Blocks would also return in the game and be used in the Reznor boss fights as each Reznor would stand on one.
 Paper Mario Series
The Paper Mario Series would see Question Blocks appear in two colors. The Red Question Blocks contain badges, while the yellow ones will contain coins or items. Some Question Blocks are invisible and are only visible when they are jump into (or using Watt in Paper Mario). They can be used for stepping stones as well.
In Paper Mario: The Thousand-Year Door during the Bowser's events. Meat will come out of the Blocks and if the player obtains four of these meats, he will turn huge and allow him to smash through objects.
Question Blocks would make a return in Paper Mario: Sticker Star. They would contain either coins, hearts or stickers.
 Mario Kart Series
Mario Kart Wii would see a shop on the Coconut Mall track, sell Question Blocks alongside other classic Mario items. There would be giant Question Blocks that would appear on Grumble Volcano on some sinking mountains.
 Super Smash Bros. Series
They would appear as objects in Super Smash Bros. Melee on the Mushroom Kingdom stage and contain items when hit. They would also appear on the Mushroomy Kingdom stage in Super Smash Bros. Brawl with the same function.
 Mario & Luigi Series
Question Blocks would appear throughout the Mario & Luigi Series. They will give Mario or Luigi coins or items when they are hit. They will turn brown after being hit and will be of no use after. If Mario and Luigi have 99 of an item found in the block, then it will stay in the block and can be obtained later. This doesn't apply to coins.
In Mario & Luigi: Superstar Saga, there is a room in Woohoo Hooniversity that is created to study many kinds of Question Blocks. It will show designs from Super Mario Bros., Super Mario World, Paper Mario and Super Mario 64.
Mario & Luigi: Bowser's Inside Story would see the Question Blocks look more like the ones in New Super Mario Bros.. There would also be a character called Broque Monieur, who is made up of Question Blocks. There is also Broggy and Broque Madame that are made up of blocks.
 Mario Tennis Open
The Question Block would not physically appear in the game but the player could purchase tennis gear for their Mii at the shop. The player could get a tennis racket for 1,400 coins, a uniform for 850 coins, wristbands for 500 coins, and shoes for 600 coins.