Spike Mat

The spike mat is a Special Agent in BTD6. It's 50 Pixels long, and when you place it on the track, it changes it's shape so it covers exactly 50 pixels on the track. It pops bloons 2 times per second when the bloon is on the mat, so it does more damage to slow bloons, and a speedy purple bloon could zip past and take minimum damage. It Costs 100 Monkey Money. MOABs fly over these.

Pro
Place this agent 50 times, and you will unlock the Spike Mat PRO! The pro spike mat can now pop bloons 3 times per second, and It now has an ability!

Super Spikes Ability: Super spikes reach up from the Mat, and pop 5 layers from all bloons, and stunning them for 1 second.

The Mat is increased to 60 Pixels long.

Epic
Place this agent 60 more times, and YOU WILL UNLOCK THE EPIC! The epic Spike Mat is 100 Pixels long, pop bloons 4 times per second, and has an even stronger ability! Oh yeah, and now the spikes are tall enough to pop MOAB class bloons! But only 1 time per second. By that I mean 1 damage.

Ultra Spikes Ability: Pops 25 layers off bloons, and does 100 Layer damage to MOABs.