Mine

Floating Mines, also known as Mines (also parsed as mines), are objects that first appeared in Super Mario World. Despite their name, they are not always shown to be explosive.

Super Mario World
In Super Mario World, they first appear in Yoshi's Island 4 as spiked balls with a wooden texture that drift in the water. They follow the current continuously and pulsate with spikes. Yoshi can step on their spikes harmlessly and eat them and a Super Star can defeat them. In the Sunken Ghost Ship, many are in free fall, making it difficult for Mario or Luigi to move around.

Super Mario 64 / Super Mario 64 DS
Mines, simply called bombs in-game, play a vital role in defeating Bowser in Super Mario 64 and its remake. In the final arenas of Bowser in the Dark World, Bowser in the Fire Sea, and Bowser in the Sky, where the mines surround the arena, Mario (or Luigi or Wario in the remake) has to throw Bowser into one of the mines to defeat him (three in the Sky). If the player jumps into one of the mines, it will blow up and they will take two wedges of damage.

There was also going to be a smaller, water-based variant, but it was cut out from the final.

Super Mario Galaxy / Super Mario Galaxy 2
Space Mines also appear in Super Mario Galaxy. They are usually immobile but sometimes move vertically or horizontally. They can be defeated if they are shot with a Star Bit. They also appear in Super Mario Galaxy 2, where they look and act the same as in the predecessor. In this game, Yoshi cannot eat them. Some may release coins, 1-Up Mushrooms, or Star Bits. Mines can also be found underwater, where they have glowing eyes and appear to be living. These ones can regenerate themselves after their detonation.

Super Mario 3D World / Super Mario 3D World + Bowser's Fury
Mines also appear in Super Mario 3D World and Super Mario 3D World + Bowser's Fury in the form of a green spiked ball with yellow spikes. They first appear in Clear Pipe Cruise. They are in the interior of Clear Pipes, blocking parts of them. Some Green Stars are among mines; if the player hits a mine, they not only take damage, but are also ejected backwards in the pipe, so its destruction is necessary to pass. They can be destroyed by a fireball from Fire Mario, a baseball, Invincible Mario or White Tanooki Mario.

Mario's Time Machine
In Mario's Time Machine, mines appear as obstacles while Mario is surfing around. In the SNES version, hitting one causes Mario to lose all of his mushrooms, whereas in the PC version, hitting one only causes Mario to lose one of them.

Wario Land: Super Mario Land 3
In Wario Land: Super Mario Land 3, small mines appear as somewhat common obstacles. They can be found on the ground, where they can be picked up, or floating in underwater, where they can interrupt a Body Slam. If interacted with, they proceed to flash and then soon explode, causing damage. The Pecan enemy can also spit mines that sink and automatically explode.

Mario Party 3
In Mario Party 3, mines (referred to as bombs) appear in the minigame Cheep Cheep Chase, where they are in the way of the players, who are being pursued by a large Cheep Cheep. To get around them, the players must dive.

Mario Party 6
Mines also appear as a projectile in Mario Party 6, in Sink or Swim. While three other characters are swimming in a body of water, one player tries to drop mines on their heads. If the mines hit someone, they do not explode. They simply knock them unconscious.

Mario Party Superstars
Mines reappear in Mario Party Superstars, reprising their roles in the Cheep Cheep Chase minigame.

Captain Toad: Treasure Tracker
Mines reappear in Captain Toad: Treasure Tracker and its Nintendo Switch and Nintendo 3DS ports using the same appearance as from Super Mario 3D World and acting in the same way. They are usually seen in levels with clear pipes and block the way of the player, such as Clear Pipe Puzzleplex. They can be destroyed by using the Super Pickax power-up.

Luigi's Mansion 3
Mines appear in the Boilerworks and the ScreamPark minigame Coin Floating in Luigi's Mansion 3. If the player goes near a mine, it flashes red and eventually blows up. Their explosion can pop Luigi's inflatable duck boat and make him drown, losing 20 HP.