I have found recent;y that i also have a +1,3k satoshis bonus. dunno where this bonus is?
You need to play the Multiply BTC game and qualify certain minimum wagered to get bonuses.
But its too hard to get their bonus, my experience is too bad in getting their bonuses always loose all the balance in my freebitcoin even they share some their trick but it wont work for me that is why i stop playing in their multiply bitcoin but i do not stop claiming in their free roll.
Well Gambling is a risky game and you need to be prepared to risk your balance to gain. I personally have found it to be amazing despite the site having a high site edge, I have gained almost half of my current balance due to multiply BTC itself. In the end, you bet only as much as you can afford to lose.