If it's old games, I seem to remember a game called Age of Wonders: Shadow magic that I really enjoyed. Other games I can recommend are Knights of the Old Republic 1 & 2, Dragon Age: Origins (the stone golem dlc is a must have). Sid Meier's Pirates! was also something I enjoyed. Vampires: The Masquerade is supposed to be really good, a bit buggy tough (If I remember correctly). Hmm, Antichamber is really good aswell, pussle solving game. FTL(Faster Than Light) is also good. This is what I can come up with right now, hope it helps.
Edit: Also, Braid, Bastion, The Stanley Parable, Brothers - A tale of Two Sons, Journey (is you have a PS3), LIMBO, Trine 1&2. All very good indie games. Oh! Legend of Grimrock 1&2 also very good
Depending on how old you might want to try Arcanum: Of Steamworks and Magic Obscura. Very entertaining RPG which allowed players to have quite a lot of choice as to how they played the game. Spent many hours playing it when I was younger.