Ice Block

Ice Blocks are a frozen version of regular block in various Mario games.

Super Mario Bros. 2
Ice Blocks first appear in World 4-1 of Super Mario Bros. 2. They act as slippery platforms. In this game, they are also semisolid, which is a feature that did not appear in later games.

Super Mario Bros. 3
In Super Mario Bros. 3, several blocks of ice appear. Throwable Ice Blocks,  referred to as White Blocks or blue blocks, resemble bricks. If a Buster Beetle gets its hands on one of these blocks, it will throw it at high speeds towards Mario or Luigi. If the player picks one up, 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.

Another rarer ice block also exists; it is transparent and can be melted by fireballs from Mario/Luigi's Fire form. Some contain coins, while others contain Munchers. Lastly, there are ice blocks that are just slippery platforms; these ice blocks can be normal (the size of a brick) or giant-sized (two times bigger, like Big Blocks). All types of ice blocks appear mostly in Ice Land.

Super Mario World
In Super Mario World, a few Ice Blocks make a small appearance in the level Awesome of the Special Zone. None of them can be picked up, as they merely serve as slippery platforms. They appear as light blue Rotating Blocks. The grabbing function of the Ice Blocks from Super Mario Bros. 3 is incorporated into Grab Blocks.

Super Mario 64 / Super Mario 64 DS
In Super Mario 64, grounded ice blocks are routinely shot out of the ice block shooter in Snowman's Land. The ice block shooter is placed on the normal route to Snowman Mountain, and its ice blocks are triangular waves that stop and disappear into the ground before reaching the freezing pond. After every four small ice blocks are shot, a large one is shot. The ice blocks attempt to push Mario into the freezing pond and require timing to jump over as they are indestructible.

In Super Mario 64 DS, additional forms are introduced. Blocks of Ice appear in the ice-themed courses Cool, Cool Mountain and Snowman's Land. They can be melted only with Yoshi's fire breath, and they often contain items such as Red Coins. In the latter course, they can be melted to collect a Power Star for Yoshi's Ice Sculpture. Additionally, massive Ice Blocks (referred to as ice cubes) appear in Chief Chilly Challenge. They serve as indestructible moving platforms.

Super Mario Sunshine
In Super Mario Sunshine, ice blocks (also called ice cubes)  are transparent blocks giving off an icy mist, and they can be melted with FLUDD. Large ice blocks appear in special stages, and small ones containing items can be found in Noki Bay and the Delfino Airstrip.

New Super Mario Bros.
In New Super Mario Bros., they are once again slippery platforms. They are found in World 5.

New Super Mario Bros. Wii
In New Super Mario Bros. Wii, there are five types of Ice Blocks: Ice Blocks that consist of enemies frozen by an Ice Flower or other ice projectile, Ice Blocks that can be picked up and thrown at enemies in World 3-4 and World 3-5 similarly to Grab Blocks (they cannot hurt players, unlike barrels), frozen-over Snake Blocks called Ice Snake Blocks that only appear in, giant Ice Blocks (in the same level mentioned) that can only be destroyed using Bob-ombs, and Ice Blocks that only appear in World 9-7, which, as in Super Mario Bros. 3, can contain coins and Munchers and can be melted with fireballs from a Fire Flower or enemy.

New Super Mario Bros. 2
In New Super Mario Bros. 2, Ice Blocks are found in World 4. Once again they cause Mario or Luigi to skid.

New Super Mario Bros. U / New Super Luigi U / New Super Mario Bros. U Deluxe
Ice Blocks also appear in New Super Mario Bros. U, New Super Luigi U and New Super Mario Bros. U Deluxe, where they reprise their role as regular platforms. Giant Ice Chunks also make an appearance in the level Piranha Plants on Ice. In the level, they are found on top of Frozen Coins, which will melt when hit by fireballs. When its Frozen Coin is melted, the Ice Chunk falls to the ground, which causes it to block some areas or crush Mario or enemies.

Super Mario Maker / Super Mario Maker for Nintendo 3DS / Super Mario Maker 2
Ice Blocks appear in Super Mario Maker, Super Mario Maker for Nintendo 3DS and Super Mario Maker 2, although they only appear as slippery platforms in all of the level styles and therefore cannot be picked up. They also cannot be melted with fire. They are given new sprites for the Super Mario Bros. and Super Mario World styles.

Donkey Kong (Game Boy)
In Donkey Kong for Game Boy, Ice Blocks are present in several Iceberg stages. They appear as small blocks of ice that are often used as a puzzle element involving Faiachū, which melt them as they walk over them.

Super Mario World 2: Yoshi's Island / Yoshi's Island: Super Mario Advance 3
In Super Mario World 2: Yoshi's Island, they serve as slippery obstacles that cannot be picked up, but can be melted by Yoshi's fire breath after eating a red watermelon, Lava Bubble, or Pyro Guy. Some Ice Blocks hide items. In this game, the blocks simply look like a block of ice.

Yoshi's Island DS
In Yoshi's Island DS, they retain their role from the original Yoshi's Island; however, they can only be melted by Baby Bowser and Scorchits, although the latter can melt some Ice Blocks that Baby Bowser cannot.

Yoshi's Woolly World / Poochy & Yoshi's Woolly World
Ice Blocks return in Yoshi's Woolly World and its remake, appearing in the levels Fluffy Snow, Here We Go! and Frozen Solid and Chilled. Like in previous games, they will melt from the effects of fire from a fire watermelon.

Nintendo Badge Arcade
Ice Blocks from the Super Mario World style of Super Mario Maker appear as collectible badges in Nintendo Badge Arcade.