User blog comment:Pingo Penguin, the Scientist/Bloon Concept: Make your OWN!!!/@comment-26187770-20160602011204

Alright. I already came up with a concept of the Steel Bloon. I'll keep you guys updated on this blog.

The Steel Bloon is a relatively rare Bloon. It is VERY difficult to pop, and is immune to sharp things, Non-Depleted Bloontonium Laser Cannons, immune to Monkey Sub AirBurst Darts, Dart Monkeys (Not including Juggernaut/Spike-O-Pult), Tack Shooters (Except Ring Of Fire), etc. etc. This giant Bloon (Should be the size of a MOAB) releases seven REGROW (Yes you heard me) BFBs which, in fifteen seconds (They act like regular BFBs), regrow into a Steel Bloon. It takes two T.T. (Technological Terror) 'Bloon Annihilation Ability' s in order to pop easily. Other wise, it's just as strong as a ZOMG, m8s! Good luck. I will comment later to upload a picture.