I did try the demo version but it seems that something went wrong
I also did tried the demo but this what it says.
Game has invalid state. please refresh the page.
I refreshed it many times but I can't play.

I just tried again and I can play it as well but yet I do not understand about this game again. I tried 2 times, first when I choose 4x payout in the end I only get 0.7 and the next game I choose exactly the same payout and get zero payout. I can play but never really understand how this is going, may be OP should explain it