The most thought provoking games?

[shio]

Planescape: Torment, no other game comes close to it. Best videogame story of all time too.

There are also worthy mentions of Deus Ex and the Fallout series. Both of them have struck my mind several times.

 

Riachu said:
Bioshock would probably be the most though provoking game of all time

Not even close.