Here's my game idea, I came up with it spontaneously when I was browsing the Internet with my dick out.

Name         :  Banner Ad Masturbation
Requirements :  Somewhat of a sex drive.
                A penis or vagina.
                An Internet connection (w/o AdBlock).
                NSFW-ready environment.
                The will to fap.
Aim          :  To cum before the timer runs out.

Rules        :  1)  You may NOT start fapping until the timer starts.  This includes 'warming up'
                    or anything of the sort.  No penis contact AT ALL may be made before the
                    timer starts.
                2)  You may not look at porn.  You may only look at the current page.  Using your
                    imagination is okay.
                3)  You may not use porn sites, or other 'sketchy' sites with imagery that may
                    assist you.

Instructions :  1)  Prepare your environment.  Having your pants off is recommended.
                2)  Open your browser.
                3)  Go to some high-profile mainstream advertisement-filled sites (e.g. Flash
                    game sites).
                4)  As soon as you see a banner/popup advertisement giving you some sort of time
                    constraint (e.g. "Click here in the next 60 seconds to WIN BIG!") with an
                    instant countdown timer, start fapping.
                5)  Fap, fap, fap.  Try to cum before the time runs out.
                    If you're successful, congratulations, you've fapped and you can continue
                    with doing more important things.
                    If you don't finish, you have to click the advertisement and do everything it
                    tells you to.