Correct answer:
Sí, me gusta jugar videojuegos
First of all, we use the word sí that means yes to affirm the answer. Since the question was addressed to me, I need to use the indirect object pronoun that matches the first person singular, which is me. An Indirect Object Pronoun is a person that receives the action of a verb indirectly. Its purpose is to tell you to whom or for whom something is done. So the action here is being performed for me. Furthermore, jugar is an infinitive verb. Finally:
- ¿Te gusta jugar videojuegos?
- Sí, me gusta jugar videojuegos