I found a glitch,if u place a tower under the upgrade button then you can get more than 1 upgrade of the same price as the previous one for a different tower.it only works rarely
and i found a bug ı got a paragron at sandbox mode placed another tower theyre textures are both tıer 0 Now ALSO THEIR TEXTURES NOT THE TOWERS THEIRSELVES AND NOT THEIR LOOKS, THEIR LOOKS WHEN YOU CLICK TO THE TOWER AND SEE ITS IMAGE (ıts lıke texture ıdk what ıts called ım not a pro god scratch coder)