We all have at least one student who walks into speech and immediately asks to play a game...
Direct that student to this visual so they can see for themselves whether it's a game day or not.
I don't have a problem with using games in speech therapy as it's often easy to incorporate goals into them, however I wanted to enforce the concept of working towards a reward.
Print out this visual and add a sticker after each successful speech session. After four sessions, the student earns a game.