Definitely the KOTOR series. I love it because there are so many ways in which you can play it so I never get bored and I love the option of going down the dark side. It also has very interesting plotlines to follow throughout the gameplay.
There is no emotion, there is peace
There is no ignorance, there is knowledge
There is no passion, there is serenity
There is no chaos, there is harmony
There is no death, there is the Force.
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