For the CSAW 2015 CTF Finals this year, myself and the guys over at Vector 35 have been collaborating on an awesome set of challenges for all the students: A custom, hackable NES game! Before you ask: Yes, we have real cartridges. And yes, they work on a real NES (we're testing builds with my [second] childhood NES, actually).
We're not quite done yet, but below is a trailer we put together as a teaser. You can blame me for the terrible pun reference to the previous Pwn Adventure games.
Special thanks to the iMovie developers for having a pretty sweet horror movie trailer template we could hijack!
UPDATE (2016-11-16): The game has now been released!