Doki-Doki Universe is an interesting cross-platform (PS4, PS3, and Vita) game that sees you traveling to different world, interacting with their citizens, and learning a lot along the way.
The game is free (you can purchase the full game with the story mode), and by interacting with the universe's inhabitants (whether that's talking with them, helping them out, etc.) you can save your robot from the scrap heap. It also contains a free messaging system across the platforms and Facebook, where friends' words will come to life in your game. You'll create and decorate your own home planet, and you can check out those of your friends as well.
To find out more about Doki-Doki Universe, and an interview with HumaNature's Greg Johnson, check out this interview.
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