Bigger Stacks



The Bigger Stacks is the second upgrade in BTD4 or the first upgrade in the path 1 in BTD5 for the Spike Factory. The tower creates double size spike stacks (10 instead of 5).

prices:
 * BTD4: $510 (Easy), $600 (Medium), $650 (Hard)
 * BTD5: $600 (Easy), $700 (Medium), $760 (Hard)