To answer this completely, a little context is necessary. Is this given as a command? WATCH THE GAME! or as a statement, "You watch the game every Saturday".
For the first, it is "Mire el juego". ("Mira el juego" for the informal). This is the "imperative" or command form of the verb "mirar".
For the second possibility, "Usted mira el juego todos los sábados" or "Miras el juego todos los sábados". Note here that the days of the week are not capitalized in Spanish.
mirando el juego viendo el juego
Te estoy observando.
To answer this completely, you would need to supply more context. In Spanish, the verb form changes depending on who does the action. "I am watching" is different than "we are watching". "Estoy mirando videos" means " I am watching videos", while "Estamos mirando videos" is "we are watching videos". It is also valid to say "yo miro videos" or "miramos videos".
iniciar el juego
El partido fue magnífico.
Una ludoteca
You could say Qué estás viendo? or Qué ves?Both would mean 'what are you watching?'
To watch = Mirar Watch (time) = Reloj
You can say "Estoy mirando el partido de los Yankees con mi papá."
"I am watching sports" would be "estoy mirando deportes".
Mirando fútbol.
viendo la televisión
Te estoy observando.
Mirando el futból.
Estoy mirando el televisor.
Me gusta ver la televisión.
In Spanish, I'll be watching you is this: Estare mirandote (accent on the second 'e' and the 'a'). It's either that or Te guardare/vigilare (accent on final 'e')
Nada, sólo mirando el juego.