User blog:Planterobloon/And it started 18 years ago (to be read after 99 red bloons)

... And it came to pass. Atenkhan, loving Dungeons and Dragons, sent a message to all the monkeys. They could become adventurers if they wanted to, gaining levels in classes like Dart Monkey and Ninja (this is like the beginning of BTD5). Unfortunately, this message and the class levels (among other things) extended to Bloons as well. Finally, the Bloons could get back from their exile.