Spike Storm is the final upgrade for the Spike Factory in Bloons TD 4, and the final upgrade of Path 2 in Bloons TD 5. This upgrade allows the Spike Factory to cover the track with an almost unstoppable wave of short-lived spikes (they disappear quickly once the effect is over) every 15 seconds in BTD4, and, in BTD5, adds an ability called Spike Storm, which takes about 1 minute to recharge. In BTD5, it can still do heavy damage to MOAB-Class Bloons because it had the MOAB-SHREDR Spikes upgrade.