3/3 and 4/4 towers (Az0riusG4mer's Conception)

Here is a list of both 3/3 and 4/4 upgrades that should appear for towers in BTD6.

Note: upgrade combinations of tiers 3 and 4 are the same on both paths, both in function and cost. For example, a dart monkey can be upgraded to 3/3 by selecting the tier 3 upgrade on the left path or the right.