When I get a game I tend to play it to see how far I can get but my untimate goal is to finish the games without any cheat code but there are certain game that I replay just for fun (Blazing Lazers, Legendary Axe, Cyber Core, TV Sport Basketball).
Or are there any games that no matter how hard you try it seems impossible to complete, for me I have a hard time completing "Space Harrier", I get to the last level but with no luck, R-type was also a bit of a pain to beat.