It just told me: "Hash or timestamp has been tampered with.
To keep things fair, games are only valid for 2 minutes, please generate a new hash."
I didn't tamper with anything.
I did hang around longer than 10 minutes though, looking at the odds it offered me.
I'm guessing the 2 minute limit is to prevent me brute-forcing the hash to find out what the number is. How about making the 'junk' an extra character or two longer, and having the games valid for an hour instead. 2 minutes arguably isn't long enough for a new user to find their wallet address, copy it into the form, get familiar with how the site works, decide what numbers to type into the boxes, etc.
And instead of making me click a link to "generate a new hash", how about just generating a new one right there and then.
Also, I keep having to re-type my wallet address. The input field isn't remembering the one I used last time, like input fields usually remember things. I keep having to go back to my wallet and copy/paste it each time.
Oh, and where's that dime you promised me?