Board Thread:Questions and Answers/@comment-69.157.7.174-20180601222801/@comment-25404524-20180615030407

There won't be a Flash version, because Flash is deprecating. I don't think there'd be an official online version of BTD6 either, since I am pretty sure BTD6 is going to be 100% Mobile/Steam. And not even HTML5 language or some other cool internet programming language either.

That must suck, but I must admit that it's the truth. :(