Easter Egg programming question

[joe7dust]

How difficult would it be to run a command if a certain series of buttons were to be pressed in a certain order? Would it be much easier to bind a hidden switch instead?

Ideally running on stock RetroPi but I'd be open to running retropi on another flavor of linux if that would be required and possible!

[Oxodao]

If you are using an Arduino that would be pretty easy, just with some if and a state variable, then when your series of press are done, send a uart message