Designing arcade machines for medical rehabilitation presents unique challenges that blend entertainment with therapeutic goals. One major hurdle is ensuring patient engagement—games must be fun yet tailored to specific rehabilitation needs. Safety is another critical concern, as machines must accommodate limited mobility while preventing injuries. Additionally, balancing difficulty levels to suit diverse patient abilities without causing frustration is tricky. Finally, integrating measurable progress tracking into gameplay requires seamless collaboration between game designers and medical professionals. Overcoming these challenges can revolutionize rehabilitation by making therapy more enjoyable and effective.