Road Spikes (Bloons Tower Defense 7)

Road Spikes are a returning road item in Thermoxin's Bloons Tower Defense 7 that return from Bloons Tower Defense 5. Each pile has 5 spikes and pops 1 layer. Each pile costs $25.

Upgrades
1/x/x - [Bigger Stacks] Doubles the size of each pile. ($25)

2/x/x - [White-Hot Spikes] Spikes can now pop frozen and lead bloons. ($40)

x/1/x - [Spikes on Wheels] Spikes move towards bloons at the speed of an orange bloon. ($20)

x/2/x - [Faster Spikes] Spikes move towards bloons at the speed of a blue bloon. ($35)

x/x/1 - [Long Life Spikes] Spikes last up to three rounds. ($15)

x/x/2 - [Deadly Spikes] Spikes deal 2 layers of damage. ($25)