For adults, I could understand having games. It would be a great way for a therapist to create an atmosphere more conducive to relaxing, and the talking you have to do to play a game could make it easier for someone who has a hard time talking to find it easier to talk. Or even start feeling like you're getting to know the therapist in a non-therapeutic sort of way where you're talking about a game instead of feelings and traumas.

But if I saw children's toys in a therapist's office, I'd assume they use them when they see kids.