User blog:Tristan395/New rules for tower upgrades

Today, Will be announced to have new tower upgrade system after BTD6 was released.

Example:

Path 1

Sharper Blades

Even Bigger Blades

Firey Blades

Magma Blades

Nuclear Blades

Path 2

BlazeBlader

Shotgunner

Shotgunner Plus

Plasma Gun

Plasma Rifle

Path 3

Bomb Spinner

Blazing Bombs

Piercing Bombs

Mega Bombs

Giga Bombs