If you’re old enough to remember the warm, soft, and inviting glow of Simon, or how Rock-Paper-Scissors was the ultimate childhood decision maker, Headcase Games’ iFist, the company’s debut iPhone and iPod touch app, just may be the mobile diversion for you.

iFist‘s rules are remarkably simple. You watch for a sequence of Rock-Paper-Scissors throws and then recall the opposing gestures before time runs out. The faster your memory and response, the bigger your score. Simple in theory, but sounds potentially challenging – - the elements of a solid puzzler/brain teaser.

Check out Headcase Games’ Twitter feed for an iFist promo code!