I got a Pi for my birthday that is on Pi day.
What it does
Plays games from my childhood.
How I built it
Easily after hours of trying to build other things.
Challenges I ran into
The Oculus Rift wouldn't work, the Leap motion wouldn't work, the Myo wouldn't work, and Google Cardboard wouldn't work.
Accomplishments that I'm proud of
I put together the Pi software correctly, and I troubleshooted many issues before that and on the way.
What I learned
Buy an Nvidia graphics card if I want to use Rift; come prepared with API that takes a week to arrive; don't go down a dead end for so long.
What's next for Raspberry Pi RetroPie Emulator: Merely installed
Augmented Reality functionality complete with a HUD GUI and motion control. (My original plan).