Rehabilitation of manual dexterity of patients with sensory motor impairments of the upper extremity due to stroke requires task-specific and repetitive exercises to facilitate recovery of a function. Given that patients require a considerable amount of time in therapy, it is essential that the rehabilitation devices are engaging and game-based to prevent the boredom of long-term repetitive task practice exercise regimes. In this study, an easy-to-use finger-thumb mechanism is designed that supports the index and middle fingers, and the thumb for patients with hand injuries. The device is connected to a game wirelessly, allowing patients to interact in real time with engaging computer games using goal-directed thumb and finger movements. The connection is established using two Raspberry Pi boards with the aid of a server-client network. The device also provides assistive-resistive forces during the game to assist or challenge patients depending on the state of their motor control. The slight delay of 10 ms for data transfer and 50 ms for game event updates enables the patients to play the game and modify the game events in real time, using the wearable device.