Track Crawler

What it does
A spider-like and MOAB-like bounty that slowly goes to the exit.

Tiers
Tier 1- Spits webs on towers that stuns them along with leaving more webs behind him.

Tier 2- At first, 3 Spider Bloons appear. These bloons have 2 stages: the first is a passive stage, where the bloons lay inside a nest of spider webs, making placing towers near them permanently stunned. The second stage is when they start moving slowly towards the end, spitting webs at towers along the way. After the Spider Bloons, a Track Crawler spawns. After that Track Crawler come 2 more Track Crawlers, this time starting from the top & bottom edges on the left side of the map, moving towards the track's exit.

Tier 3- 4 more Spider Bloons are added, however, these are invulnerable up until later in the game, where they lose their invulnerability 1 by 1.