I still play Dodge 'Em, Journey Escape and Pitfall from the 2600 because these all take me back to my childhood in the 80s. On the C64 love Trolls and Tribulations, Archon, Ultima 3 and 4, and the Infocom games, especially Zork 1, 2 and 3. Even though I played them through more than once, each time it takes me back to when I first played them.