I'm probably dumb, but I don't get it. Perhaps some instructions on the page would help.
Viewing post in Coin Flipping with Leaderboards comments
On the top you have a number - it's your number. After that you have some buttons - they are your options. Each option has two outcomes on it: one for when the coin lands heads, and one for when it lands tails. When you click on an option a coin is flipped and one of the outcomes is applied to your number. You can also unlock some new options for a price. After that, you have leaderboards with other people's numbers.