Mines are objects found in levels. Mines are hidden in the ground and are usually marked by minefield signs.
Mines explode about a quarter of a second after being triggered. Mines are triggered by player or an enemy walking over a mine tile. Mine tiles can be detonated by destroying them with a firearm. Explosions can also trigger them.
Even without signs, mines are visible, but only barely, by a dot that will flash red if triggered and explodes shortly after, the player will only be able to escape if they are fast enough. Their trigger delay was so short that if an Attack Dog runs by and triggers the mine it's guaranteed death for the dog. Certain bros have the ability to either bypass mines or cancels their explosive damage.