Editing Tower Evolution (section)

==Levelling==
[[File:TowerEvolutionScreen.png|250px|thumb|Research Menu for [[Juggernaut]].]]
Certain towers will have an evolved version of itself. When this is the case, the tower will have a orange progress bar in the inventory, indicating the current level of the tower. In this case, the only level that actually matters is the last one, as all others have no impact on the tower. Once the final level is reached, the evolved tower will become available for purchase. The player can also skip getting experience with robux.

For the evolved tower itself, the levels play a far bigger role as the tower itself starts out with only some of its upgrades unlocked. Every upgrade past the ones unlocked at an evolution level of 0 require for the tower to be leveled up. The player does not get to pick which upgrades they unlock as each one has a determined level it is unlocked on. Similarly to the tower it evolved from, the player can also skip getting all of its experience with Robux.

Each tower can have a varied number of levels, though outside of development screenshots towers only have gone up to 20 in the actual game. To calculate how much experience a tower needs to level up, the game uses the tower's base exp and growth rate. It is calculated using the following equation:<br/>
<math>\text{Base Exp} \times \text{Growth Rate}^{\text{(Level} - 1\text{)}}</math><br/>
The result is then rounded down.

Experience for towers is gained by having the tower placed down at the end of the match. All tower experience gained is the same regardless of how many times that tower is placed. Selling all of a tower before the end of the match will result in no tower experience being gained, and if that tower is placed again the EXP earned would return back to what it was. Experience is rewarded when a tower was just placed down on the map by the player, with the amount depending on the mode and what wave they got to. This value cannot be boosted by map difficulty rewards scaling or any modifiers which claim to boost experience, like [[XP Boost]], but it is increased by modifiers that increase currency rewards in general, like the [[Challenge Trials]] modifiers.