From that list, I like to play in freebitco.in because it's easy to game and we don't have to send anything. Besides that, we can get free coins by playing faucet and then we can try to multiply. Once I can get lucky in the multiple sections, and I can get almost 0.01 btc, but then, greediness comes to me and tells me to continue. But suddenly, I get lost in all the money. In that time, I feel it's sad because I have an option to withdraw the btc amount but I choose to continue the game, and I only lose the money.