The spike mat is a Special Agent in BTD6. It's 100 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.