Adventure, a.k.a. Colossal Cave Adventure, on my Black Apple ][ (my parents were both in the educational field so I was able to get one of the only-sold-to-school Bell & Howell models) back in 1979.
Do I wish it were something different? Hell no! It was a great brain-tester, required a lot of imagination, and I still remember cracking up at the line "Congratulations, you have just vanquished a dragon with your bare hands! (Unbelievable, isn't it?)"