It has to be one game that you feel most passionate about and the one that you think deserves a sequel keep in mind you can bring back the original devs and voice actors if needed and you can have a huge AAA budget what game would it be?
Mine would be Sleeping Dogs I feel this game was almost perfect on every level I would like to see the main character come back with the original voice actor and some past characters appearances as well. It would be set in Tokyo and the oringal devs United Front Games would come back to help develop it. Every year I go back and play Sleeping Dogs at least once and think what could of been and it really sucks that Square Enix gave up on it. The game is better then any Watch Dogs or Saints Row game easily. I would take this over Half Life 3 and no I'm not joking Half Life is great but it's not what I really care about that much anymore the passion for that series is pretty much dead for me.