Long Life Spikes

"Spikes last much longer and can carry over one round."

- Upgrade description in BTD6.

Long Life Spikes is the 3rd upgrade of Path 3 for the Spike Factory in BTD6. The spikes produced by the Spike Factory can pop the same amount of bloons as the base form (which is 5 [6 with Bigger Stacks]). However, the spikes look different, turning them into blue spikes. These spikes can last much longer than the other spikes produced by the Spike Factory. They can last up to one round, or an average of 2 and a half minutes.

Tips

 * Always purchase this upgrade on single-entry-single-exit maps near the end of the track. Then spikes won't be used up immediately, allowing spike stockpiling to slowly make the tower more and more valuable. Even though this may make the Long less useful evidently, it is still the best way to use it.
 * It is recommended to purchase the Path 2 Upgrades (Faster Production and Even Faster Production) over the Path 1 Upgrades (Bigger Stacks and White Hot Spikes) as Bigger Stacks only increases its pop count per spike from 5 to 6 and although White Hot Spikes allows it to pop any D.D.Ts that may rush through your defense, a Monkey Intelligence Bureau can easily solve that problem while also providing it and other nearby towers with the bonus as well.
 * Try not to leave the game, as the stockpiled spikes do not carry over between saves.