The Good Behavior Game (GBG) is a simple group contingency derived from the field of Applied Behavior Analysis (ABA) that has been used in many educational settings with children to increase academic skills and appropriate classroom behaviors. Little research has evaluated whether the GBG can be used with adults and in workplaces to increase appropriate work behaviors. Feedback and reinforcement on performance embedded in the GBG can be used to target specific workplace behaviors to be increased or decreased. The purpose of this study was to evaluate the impact of group contingencies modified in a gamification format inspired by the GBG, at an ABA clinic on individual technician-client engagement levels using a reversal (ABAB) design. Participants were assigned to one of two groups and client engagement levels were observed across all intervention phases. Results showed that feedback and reinforcement given during the group contingencies inspired by the GBG can increase individual technician client engagement levels among adults in a behavioral clinic.