React!

A Homer Simpson simulator - Rock, Paper, Shotgun

As none of us is an actual nuclear engineer, we have no idea on how to turn off a nuclear reactor (unless you are a nuclear engineer and you're playing this because you're not allowed to play with the nuclear reactor at work).

Instructions

Classic

Two random letters in your keyboard turn off the reactor. When you press a correct button, one of the lights turns green.

Press both buttons at the same time and hold them to deactivate the reactor.

Rush

There's a light next to the button. It can be green or red. If it's green, press spacebar. Otherwise, don't touch anything! You have half a second on each button, so... React! Fast!