Sneaky Creeper

Sneaky Creepers are a type of Creeper that spawn exclusively in the Gunpowder Mines. They have the appearance of a normal creeper - however, they are invisible until they approach the player.

This mob deals 80 damage upon exploding.

Behaviour
The Sneaky Creeper spawns in the mines completely invisible.

Upon getting in range of a player, the Sneaky Creeper will become visible. It will then also begin to explode, like a normal creeper. If the player runs away before it explodes, it will stay visible, and act entirely like a normal creeper. Killing the Sneaky Creeper before it explodes will prevent the explosion, granting XP and some Gunpowder.

Stats
The Sneaky Creeper spawns with and level 3. This makes it a challenging foe during the early-game, but relatively non-threatening later on, especially once the player obtains Lapis Armor or above.

Strategy
Sneaky Creepers are not really a threat, but it is hard to kill them without them exploding. If you really want to kill them to collect gunpowder, then, as soon as you hear the "sss" sound, run away until they defuse and then either come back with your sword or finish them off with a bow.

A bow with Aiming will also track towards invisible creepers within range. Blindly shooting with the enchantment can be an easy way to spot and kill creepers.