I think all of us have some games in our collections that we have never played for one reason or another. I'm listing my top four games. Some of these games are new and some are old. I'm leaving out games that are similar to other games but vary in how they handle some aspect of the game system. Without further delay, let's look at the games.
ALIEN The Role-Playing Game: I have the starter set and the core rulebook so far and I would buy more books. I've been a fan of the original Alien movie and Aliens for many years. I have all 6 of the movies on DVD and I've read 10 of the novels so far. While opinions on later films differ, I find something of interest in all of them.
Ars Magica Third Edition: I bought a copy of the core rulebook and Mythic Europe last year from a friend that was thinning out his collection. I was intrigued by the focus of the game being on wizards when it was originally released, and I always intended to buy a copy. Years later and I finally own a copy. The reading has been interesting so far.
The Dark Eye: I have the three main rulebooks. I picked up the digest-sized versions because I could buy all three of them for basically the cost of the standard sized core rulebook. TDE fascinates me because it's basically "Germany's D&D" and the world is open and growing with fan contributions.
Lejendary Adventures: I bought the three main books upon release. I know some complain about this game because it is so different from D&D in the rules, but I actually like the differences because it makes the game unique. I admit that it was a little challenging upon my first reading, but I did get it figured out when I changed my approach. I started with the definitions at the front and expanded out from there and everything clicked. I would have to refresh my memory, but I would play the game if the opportunity came.
The reason I havne't played these games is simple. I don't currently have a group and I haven't had one for years. I'm sure there are games that you have but you have never played so what are they?