Where can I find the save file, and how can I edit it?
I tried Google, but only cheat engine results turned up. :(
You can find the save file for Bloons TD 5 Deluxe (now known as Bloons TD 5 Steam) at the following location:
C:\Program Files (x86)\Steam\userdata\(your steam ID)\306020\local\data\docs.
OldProfile.save and Profile.save is your save file.
%APPDATA%\Macromedia\Flash Player\#SharedObjects\<random numbers and letters>
. From there, go to the site you played it on (e.g. kongregate.com) and look for it. As for editing, you can use a.SOL
editor like .minerva.