[robert_tweed]

I'm not sure if there's a list, but a notable example of this is Day of the Tentacle, the sequel to Maniac Mansion.

In the game there is a computer, which if you interact with it, allows you to play the entire original Maniac Mansion.

[erwincoumans]

Fun, didn't know that. I recall both games, Maniac Mansion on C=64. Impossible Mission is the first game I recall with working terminals inside (but those terminals didn't play a full game although it likely could be done).