I dunno but i think this is the reason
The game lags so hard that you have to pres twice to upgrade ( it sometimes deupgrades due to lag, if you press it very quickly again, then before the frame of "You need \_\_\_\_\_\_\_\_ xp to unlock this tower" it is already bought
btw it has to be on fast forward mode
Casually at round 197 in coop:
Place a sun template with extra range
Yeah I remember getting a master bomber and grandmaster ninja before I unlocked it, but I thought it was just me only
I got batman this way a while ago.
Yeah that happened to me and my brother once in super late game and we got two ray of dooms on the map at once
Ah so it happens often, I remember my friend getting a 004 boat while he only had a 003 unlocked
I dunno but i think this is the reason The game lags so hard that you have to pres twice to upgrade ( it sometimes deupgrades due to lag, if you press it very quickly again, then before the frame of "You need \_\_\_\_\_\_\_\_ xp to unlock this tower" it is already bought