A Crazy Creeper is a mob spawned after killing 10 Creepers.
This Creeper looks like a regular Creeper, except that it's eyes are red, skin gray, has arms, and is 3 blocks tall. They can be quite tough to take down.
How to Kill Them
To kill a Crazy Creeper you need at least an iron sword, wood and stone are just used for knockback on him, but since he has arms, he can break blocks like your door and the block above it, then it enters and BOOM.
Damage and Attacks
Attack #1 - Explosion (Kills player instantly)
Attack #2 - Stone Sword (5 damage)
Attack #3 - TNT (Kills player instantly)
A Crazy Creeper has a random amount of health, it varies from 10 to 22.