Games with interesting content that unlocks after beating the game - an IFDB Poll

After playing Tenth Plague, I was interested when I saw the game had a commentary mode. I was looking for similar "extra content" in other games.

	Six, by Wade Clarke 2 votes "new character, new puzzles, same map" [+]... (No comment) [+](No comment) () --Sobol... Vote for this game

	Violet, by Jeremy Freese 1 vote "Unlocks author commentary " [+]... Vote for this game

	Child's Play, by Stephen Granade 1 vote "commentary track" [+]"commentary track" () --Emily Boegheim... Vote for this game

	A Roiling Original, by Andrew Schultz 1 vote "self-vote: new area" [+]... Vote for this game

	the uncle who works for nintendo, by michael lutz 1 vote (No comment) [+](No comment) () --Doug Orleans... Vote for this game

	Leadlight Gamma, by Wade Clarke 1 vote (No comment) [+]... Vote for this game

Is there another game that you think should be on this list? Just fill in the title of a game you'd like to vote for.