Aww no free buttons? LOL

Interesting project, thought on how to wire it up? I2C would give great flexibility but require a cheap uC per button (or cheaper, column of buttons, those 4 cent or whatever OTP cheap uCs could be great for this, 14 pin so one per column would be doable pretty easily)

(If you haven't heard of those, bug me, I can find the link off youtube, lots of good info out there.)