First roll 2^0
Second roll 2^1
Third roll 2^2
I tried to play the free roll without solving the captcha to see how it works.
For me, the cost to do that for the third time wasn't 2^2 reward points. It was 3 reward points. So, I guess it would increase by 1 every time you play the free roll without solving the captcha.
I don't know, maybe I am not very sure but seems to me the increase each time a player plays the free roll without a capt ha never really used to be, in previous times when I always still actively playing the free roll, not using the captacha used to cost a flat 1 reward point, and it doesnt matter whether one plays the free roll 1 million times in a day, the cost was static or fix at 1 reward point.
I have not played on freebitco for a while now, well, let me just say for several months now, even before the whole issue with them and their services started, so, I guess they must have changed the mechanics of playing the free roll without captcha.
And on a second thought though, what if they are the ones who decided to turn off the captcha, so to enable them reduce the reward users get from playing the free roll?