Wew, this is a strong bracket. I had to snub Mario's Picross!
Voted for Journey, which is a beautiful experience, Grim Fandango, which is a clever exemplar of the P&C adventure genre, and tossed my last vote to Progress Quest, perhaps the first idle game and a witty and well-implemented RPG satire at that.
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Any genre-definers deserve three votes from me. Super Mario Bros pretty much defined and/or refined the platformer genre. Before it, what was there? Pitfall, I guess. Gave SMG2 a few votes too, since it's a stellar experience, and a final respect vote for Grim Fandango. I wasn't a fan of it, but I respect what it was trying to do.