It's such a cop out to compare games to Portal, but the sad truth of the matter is that Portal is about the most clever thing to happen to games in a long time, and it's been a long time since then that anything else has come close to matching it.

Really though, if Antichamber is Portal's gameplay successor, then The Stanley Parable took the narrative baton and ran with it. Clever, witty, charming, and all of those other adjectives you apply to fun stories. I had a blast with this "game" from start to finish. It will subvert your expectations and leave you with a smile.