I still have some of my old game cartridges for the Sega Genesis. The game console itself is broken.
There's also several games I got for the Playstation 1. These work but some of them I have never played, or played only once or twice.
The reasons that I don't play these games is because of one or more of:
1. I started playing and quicky discovered that the game isn't very fun
2. The controls and features are complicated and difficult to use, and I didn't feel like spending a long time learning all the special button combinations, and practicing until I get used to it.
3. There's some other game that I like, that I would rather spend my time playing, so I always end up playing those instead.
4. A friend gave me the game as a birthday present or Christmas present, but it's not the genre that I like.
5. I started playing and at some point I got stuck at a difficult place that I couldn't get past. I tried several times and gave up.