Upgrades
How many levels can I upgrade my towers and other things?
I currently have level 16 Faster Rocket Reload and Level 12 Stronger Explosives, which makes the game very easy up to level 45 so far, but I am curious as to how many levels can I upgrade this too.
Upgrading it to the next level cost over 600,000 so it is going to be a while till I find out Im sure.
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