My one favourite game ever is probably Fahrenheit (or Indigo Prophecy as it's called in the US). Though it is an old game it has a great story and atmosphere, inventive gameplay, believable characters as well as great voice acting and soundtrack. I've played it through three times, which is kinda unusual for me.
Runners up would be The Longest Journey and Monkey Island 3.
What is your favourite game if you can choose only one?
Runners up would be The Longest Journey and Monkey Island 3.
What is your favourite game if you can choose only one?