Leroux: Does this count? ;)
Social Justice Warriors (Didn't try it myself though.)

babark: Antichamber is sort of like that, and a pretty interesting game too. Challenges your notions of instructions in games and expected things to do.

Another surprising example, if you ask me, is Spec Ops: The Line. You start out playing it assuming it is just some typical cover-based military shooter involving some random army grunts, but it ends up being some sort of crazy thought-experiment where the game is directly addressing you (the player) and making you question yourself and what you're doing.

F4LL0UT: To me a meta game is a second gameplay layer. Like a turn based map connecting and influencing real-time battles. :P

Cyraxpt: I always thought that meta game was the definition for following the rules imposed by the community (since i heard it on ganes like League of Legends ) and that Breaking the fourth wall is what it was called for the games/situations mentioned on the op. Living and learning i guess...

Btw, that Atum game looks amazing, i was watching a video and the solutions to pass the obstacles is mind blowing, definitely on my radar, i hope that it ends here on gog.

Funny that i was initially dismissing the game since i was having a brain fart and associating the game's name to portuguese meaning (Atum = Tuna).

flummoxed: Well, it's just the term that I use for these games. I may be using it wrongly :) And yeah, when I first saw Atum I was like that too. It's got some really great ideas.
Also, "Tuna" - now there's a great name for a game! :D

Cyraxpt: According to wikipedia it's both:

"Metagaming is any strategy, action or method used in a game which transcends a prescribed ruleset, uses external factors to affect the game, or goes beyond the supposed limits or environment set by the game. Another definition refers to the game universe outside of the game itself."

I also wonder if Atum won't be in the same situation as Braid, it has that mind blowing puzzles early but then it becomes trivial (still a good game).

Mr.Caine: Hotline Miami has a nice meta edge both to it's story/gameplay.

Nirth: And what is that?