Use the mouse to click on the lights, or the following keys. 

R - Red G - Green 
B - Blue Y - Yellow 

"Simon's a computer, Simon has a brain, you either do what Simon says or else go down the drain."

You can hear sound of jaws hitting concrete as copywriters across the globe are stunned into amazement over that there Simon Says slogan from the mid '80s.

The idea of the game is a simple one, as Simon likes to say. Follow the pattern of lights and sounds for as long as you can remember them. The lights show up faster the more sequences you correctly recall. The obvious cheat is to write down each light in turn, but let's pretend we can't do that...