Well just because play therapy is effective in general doesn't necesarily mean that it's effective for treating ADHD. That's a lot different then just having externalizing/internalizing symptoms. I'm not at all up on that area of research.
There are board games that try to teach children to be less impulsive and to stop and think. I usually think of them as being more akin to manualized CBT treatments then to play therapy, but again the line may be a little blurry. I could imagine them being useful for some symptoms of hyperactive type ADHD. I'm not sure how evidence based games like that are though, although they are certainly popular.
As a final note on play therapy, sometimes it is your only real option. I've done mandated counseling with 3 year old children with a variety of issues, and I'm not sure what other form of therapy I could possibly use there. Many have very limited language even by the standards of a 3 year old.
Originally Posted by Sobe203
Thanks for explaining Play Therapy in greater depth! I'd heard from a few Ph.D.-level clinicians that Play Therapy is ineffective, notably for treating ADHD, so I was surprised when I began finding so much empirical support for it.