Got it to 0.5991561181434598 after a while (totally random would be "0.5"). Not sure how "free will" comes into play, if there was indeed free will, I could have freely decided to only press one, and the Oracle would have had close to 100% certainty. Rather, what it measures is randomness or predictability, which is not the same thing as free will (especially "after the fact", e.g. after the choice is made).
> I couldn’t even beat my own program, knowing exactly how it worked. I challenged people to try this and the program was getting between 70% and 80% prediction rates. Then, we found one student that the program predicted exactly 50% of the time. We asked him what his secret was and he responded that he “just used his free will.”