Quickly press the green flag twice to activate. Arrow keys to move. Set your difficulty with the slider before it disappears. Try to last A.L.A.S (As long as possible). Good luck. You'll need it... P.S. The difficulty thing is NOT easy to hard. It depends on what is hard or easy for YOU.
I saw Yllie's project, "Rocket Science," and I thought, 'If he could could make such a cool and complex project, why can't I try to make a simpler version?' Go follow him! @Yllie