The experimental group initially got VR intervention by playing all four easy-level games twice for three minutes each during the first and second weeks. This group again underwent VR intervention, playing all four same games with a difficulty level of twice 5 min duration for the third, fourth, fifth, and sixth weeks. The experimental group had an intervention of 24 sessions, lasting 4 days/week for a total of 6 weeks. During the first two weeks, patients received 24 minutes of VR hand games and 24 minutes of therapy sessions per day and for the next four weeks, this group received 40 minutes of VR hand games and 40 minutes of conventional therapy session per day. This group received conventional physical therapy that consists of range of motion, stretching, resistance, and strengthening exercises. At follow-up of two weeks this group only received conventional physical therapy.

The control group received conventional physical therapy, which consists of range of motion, stretching, resistance, and strengthening exercises. The CPT group had a conventional intervention of 24 sessions, lasting 4 days per week for a total of 6 weeks. The CPT group was given 48 minutes of conventional physical therapy sessions per day for weeks 1 and 2, followed by 80 minutes of conventional physical therapy sessions per day for the next 4 weeks. At a follow-up of two weeks, this group also received conventional physical therapy.

The experimental group initially got VR intervention by playing all four easy-level games named hitting a rolling ball, grasping a balloon, swapping hands, and gripping twice for three minutes each during the first and second weeks. This group again underwent VR intervention by playing all four same games with a difficulty level twice 5 min duration for the third, fourth, fifth, and sixth weeks. The experimental group had an intervention of 24 sessions, lasting 4 days/week for a total of 6 weeks. During the first two weeks, patients received 24 minutes of VR hand games and 24 minutes of therapy sessions per day and for the next four weeks, this group received 40 minutes of VR hand games and 40 minutes of conventional therapy session per day. This group received conventional physical therapy that consists of range of motion, stretching, resistance, and strengthening exercises. At follow-up of two weeks this group only received conventional physical therapy.

The Fugl-Meyer Assessment-Upper Extremity subscale was employed to examine the motor function restoration in the upper extremity of stroke patients following interventions. The Fugl-Meyer Assessment-Upper Extremity consists of 33 items that assess motor function, with a scoring range of 0-66, The minimum score 0 represents severe impairment, and maximum score 66 represents normal motor function. Higher scores indicate better motor function.

The Action Research Arm Test is utilized to examine the functional capabilities of stroke patients upper extremities, specifically in terms of reaching, gripping, pinching, and overall movement tasks. Each item is allocated a rating score of 4 points, with the potential total values ranging from 0 to 57. The minimum score 0 represents severe impairment, and the maximum score 57 represents normal upper extremity function. Higher scores on the Action Research Arm Test indicate better functional capabilities of the upper extremities.

The BBT evaluated the manual dexterity of individuals who had suffered a stroke. During this assessment, participants are required to transfer blocks from one container to another within a one-minute time limit.

Electromyography signals are obtained in order to evaluate the electrical activity generated by muscles. Electromyography was utilized for the objective assessment of the effectiveness of immersive VR-based hand games. The objective assessment includes the evaluation of the correlation between electromyography signal features and clinical outcomes, which includes the Fugl-Meyer Assessment-Upper Extremity, Action Research Arm Test, and Box and Block Test.

The Modified Barthel Index assesses an individual's ability to perform both practical and routine tasks independently. The Modified Barthel Index consists of 10 items, each scored based on the level of assistance required or the level of autonomy demonstrated by the patient. The total score ranges from a minimum of 0 to a maximum of 20. Lower scores indicate greater dependence, with scores below 10 typically representing severe disability and scores below 15 usually indicating moderate disability. Moreover, higher scores reflect greater independence in performing daily activities.