I think I found a bug in the Citadel DLC: Shepard refuses to play the Towers of Hanoi game in the arcade.
Not a bug. An in-joke
I know - I was being sarcastic. And mildly disappointed that they played it straight instead of reviving and old friend.
(It showed up in several other Bioware games too, before Dragon Age
had a tombstone for the "unmourned" T. Hanoi.)