Gamified training is a novel management control system in which companies use gamification techniques to engage and motivate employees to learn. This study empirically examines the performance consequences of gamified training by conducting a field experiment in a professional services firm. We find that the main effect of adopting the gamified training platform on performance is not statistically significant at conventional levels. However, we also find that the effect is moderated by employee engagement, such that the gamified training platform improved performance in offices with high employee engagement and worsened performance in offices with low employee engagement. In offices with high levels of employee engagement—with above-median rates of employee retention and willingness to log onto the training platform—each additional minute of average platform engagement per employee led to an additional 0.28 new clients per month. In offices with below-median rates of employee retention and willingness to log onto the training platform, each additional minute of average platform engagement per employee resulted in 0.78 fewer new clients per month. Taken together, these results suggest that gamified training, which, in part, is intended to help engage and motivate employees to learn, may only yield performance benefits among those who are already highly engaged and motivated.