White Hot Spikes is the 3rd upgrade in BTD4 and the 2nd upgrade of path 1 for the Spike Factory in BTD5. It costs $300 on Easy, $350 on Medium and $380 on Hard in BTD4. It costs $765 on Easy, $900 on Medium, $970 on Hard and $1080 on Impoppable in BTD5. It enables the spike factory to pop Lead Bloons and with its road spikes. They can also pop frozen bloons if the Spike Factory is near an Ice Tower . The spikes turn red at their tips. The ability to pop leads only requires the first tack to break through the lead layer and thus, puts the lead-popping ability of the other tacks in the spike into waste. It is recommended to get the first two upgrades of path 2 before getting this one. It is usually useless to get this upgrade, except if you're going for a Spiked Ball Factory, or if you're fi