Upgrades

What Are Upgrades?
Upgrades are used to make towers in your game more effective against enemies. Upgrades include increasing the Damage of a tower, the Rotation and Projectile Speed, or even the unique features for a tower, like Stun Chance for Blast towers or Aim Time for a Sniper. There are two different types of upgrades; the In-Game Upgrades for individual towers that can be bought with Coins, and Global Upgrades that apply to a specific type of tower throughout all games that are bought with Green Papers at the Global Upgrade Screen.

Global Upgrades
Global upgrades are upgrades that you can get to modify a towers base stats and cost of the tower or its upgrades. These are typically minor upgrades that increase the base stats of the tower, but are still useful nonetheless.

In-Game Upgrades
In-game upgrades can make your towers shoot faster, have further attack range, do more damage, improve rotation and projectile speed, and sometimes specific upgrades that apply to the tower's gameplay.